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The only thing to remember here is that if there's some kind of arrangement involved, then permutations must used. But if you're to select something the you're to use the combinations. You can refer to this website for learning this topic: http://www.mathsisfun.com/combinatorics/combinations-permutations.html . If you want to master this topic, solve as many questions as you can. I also used to be bad at this topic, so I solved a lot of questions on this topic and those questions which i solved were much much harder than these. So now as i had solved the harder ones, I don't feel problem in these easier ones. So just practice, that's all that I can say. Best of luck!Rizwan Javed Wow you're really at good at permutations and combinations. I find them rather difficult actually so any general tips that you could pass on?