I think the mod maths one mainly is not the permutation and combination... dun la confuse the fella further XD

It's usually when you have like a bag of 20 balls : 8 red, 6 blue, and 6 green. And you have 5 chances to reach into the bag and take out a ball.

Kebarangkalian bersandar (dependent probability) is the one where the probability of getting a red ball in your second, third, etc tries are dependent on the result of the previous tries. Meaning at first the chance of taking out a red ball is 8/20. if you take out a red ball in the first try, the chance of getting a red ball in the second try is 7/19 because there are 7 red balls left and 19 balls left in total.

The one that is not bersandar is if you replace the ball into the bag each time you take one out. Then, if you get a red ball in your first try, the chance of getting red ball in your second try is the same: 8/20.

Hope that helped.