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SPM Thread 08/09 (V 3), SPM is coming soon..!!!! Final days..!!
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TSvick5821
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 Nov 7 2008, 02:03 PM
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QUOTE(Kernkraft400 @ Nov 7 2008, 12:40 AM) Yes that could be the only explaination. We tend to forget that, that is the distance travelled downwards whilst the object tend to move upwards at the same time. This concept is heavily used in physics when calculating the time of an object going against the speed of sound where sound is reflected as it comes and goes, this has to be divide by 2. In this case it is times 2. Moreover, 1800 - 180 because it does not go back to the initial point. Tricky question. i dun understand.. here's another ques.. The first term and n th term of an arithmetric progression is -5 and 25 respectively. Given that the sun of the first n terms is 50, find the value of n. how ? i got many more ques abt progression..but now ask 1 first |
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IamjustME
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Nov 7 2008, 02:15 PM
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n=5
I want a cookie!
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TSvick5821
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Nov 7 2008, 02:18 PM
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QUOTE(IamjustME @ Nov 7 2008, 02:15 PM) how la? |
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IamjustME
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Nov 7 2008, 02:24 PM
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Sn= n/2 x (a+l)
50 = n/2 x (-5+25)
n=5
Voila!
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TSvick5821
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Nov 7 2008, 02:27 PM
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oh shit..forgot got 2 formula to find sum of the term is AP
Added on November 7, 2008, 2:34 pmGiven p= q + 4 + 4/5 + 4/25 +...... is a series of GP with infinite number of terms. find the value of q and p
This post has been edited by vick5821: Nov 7 2008, 02:34 PM
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IamjustME
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Nov 7 2008, 02:39 PM
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QUOTE(vick5821 @ Nov 7 2008, 02:27 PM) Given p= q + 4 + 4/5 + 4/25 +...... is a series of GP with infinite number of terms. find the value of q and p q = 4 x 5 = 20 p = 20/(1-1/5) = 25 |
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TSvick5821
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Nov 7 2008, 02:42 PM
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how u get?
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IamjustME
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Nov 7 2008, 02:45 PM
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That was how I got.
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billygoh
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Nov 7 2008, 02:49 PM
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omg...4 days more...
any tips for revise sejarah spm?
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TSvick5821
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Nov 7 2008, 02:53 PM
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QUOTE(IamjustME @ Nov 7 2008, 02:45 PM) how lo? |
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work_tgr
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Nov 7 2008, 02:59 PM
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QUOTE(vick5821 @ Nov 7 2008, 02:53 PM) p is the first number of the GP then ... to find the sum, use formula with r<1 --- aiyoo ... holiday for you, just relax a bit. This post has been edited by work_tgr: Nov 7 2008, 02:59 PM |
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TSvick5821
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Nov 7 2008, 03:01 PM
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dunwan..i want to study
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miccy
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Nov 7 2008, 03:17 PM
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Getting Started
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QUOTE(work_tgr @ Nov 7 2008, 02:59 PM) p is the first number of the GP then ... to find the sum, use formula with r<1 --- aiyoo ... holiday for you, just relax a bit. although i'm not good in add math its quite confusing here, i thought IamjustME use sum to infinity and u mistake p with q?  p = 20/(1-1/5) = 25 q is the first number of the gp btw vick5821, u r an spm student rite? This post has been edited by miccy: Nov 7 2008, 03:18 PM |
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TSvick5821
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Nov 7 2008, 03:19 PM
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no..i am form 4
Added on November 7, 2008, 3:24 pmcan pls explain the rubber ball that ques for me? why use sum of inifinity?
This post has been edited by vick5821: Nov 7 2008, 03:24 PM
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miccy
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Nov 7 2008, 03:32 PM
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Getting Started
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QUOTE(vick5821 @ Nov 7 2008, 03:19 PM) no..i am form 4
Added on November 7, 2008, 3:24 pmcan pls explain the rubber ball that ques for me? why use sum of inifinity? my mistake,  i thought only form 5 students spamming here like me the question infinite number of terms wouldnt it suggest u to use sum to infinity? btw, u should change the thread sub title its 4 more days and im still not studying!  This post has been edited by miccy: Nov 7 2008, 03:35 PM |
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TSvick5821
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Nov 7 2008, 03:36 PM
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guys..a ques more..
Find the sum of the first 10 alternative terms starting from 2nd term of the following sequence
a) -10 , -8, -6, -4
pls list out the steps.
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miccy
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Nov 7 2008, 03:44 PM
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Getting Started
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QUOTE(vick5821 @ Nov 7 2008, 03:36 PM) guys..a ques more.. Find the sum of the first 10 alternative terms starting from 2nd term of the following sequence a) -10 , -8, -6, -4 pls list out the steps. could u pls tell me the formula of Sn of AP? i couldnt remember search in google no luck always shows diff formula Guys check this out!!! http://bmxpres.com/ |
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TSvick5821
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Nov 7 2008, 03:46 PM
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QUOTE(miccy @ Nov 7 2008, 03:44 PM) could u pls tell me the formula of Sn of AP? i couldnt remember search in google no luck always shows diff formula Guys check this out!!! http://bmxpres.com/Sn = n/2 [ 2a + (n-1)d ] or Sn = n/2 [ a + l ( last term) ] |
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work_tgr
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Nov 7 2008, 03:53 PM
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QUOTE(vick5821 @ Nov 7 2008, 03:01 PM) all work with no play makes Jack a dull boy.  QUOTE(miccy @ Nov 7 2008, 03:17 PM) although i'm not good in add math its quite confusing here, i thought IamjustME use sum to infinity and u mistake p with q? p = 20/(1-1/5) = 25 q is the first number of the gp btw vick5821, u r an spm student rite? opps .. my mistake. you r right. QUOTE(vick5821 @ Nov 7 2008, 03:36 PM) guys..a ques more.. Find the sum of the first 10 alternative terms starting from 2nd term of the following sequence a) -10 , -8, -6, -4 pls list out the steps. meaning for this AP, a=-12 d=2 n=10 then .. find it out. |
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miccy
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Nov 7 2008, 03:57 PM
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Getting Started
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Could u explain why a=-12 why wont it be -8?
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