There are 10 pairs of socks and 2 socks are worn from that such that the pair of socks worn are not of the same pair. what is the number of pair that can be formed.	Choose the correct choice from the following choices.
A) 90  B) 85  C) 75  D) 95  E) 82

Rationale: first of all you should remember that there is a difference in left and right sock . now no . of way to select any of the sock = 10 and for second = 9 so total methods = 10 * 9 = 90 answer : a
Answer: A