4) There are 5 distinct pairs of white socks and 5 pairs of black socks in a cupboard. In the dark, how many socks do I have to pull out to ensure that I have at least 1 correct pair of white socks? a) 3 b) 11 c) 12 d) 16

It will be 12, there is total of 20 socks, At the worst case you have chosen 10 sock i:e 10 attempts , To get a pair of white socks you need 2 choose 2 more socks which must be 2 for making a white pair.

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