Book Maths Puzzle Numerical Ability

in a party there are 5 couples. out of them, 5 people are chosen at random. find the probability that there are at least two couple?

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Book Other Question

if all possible 4 digits numbers are formed using the digits 5,6,7,8 without repetition and arranged in ascending order of magnitude then the position of the number 7685.
a) 16
b) 17
c) 18
d) 15
ten placed are placed at random in a shelf. what is probability that a pair of books will always be together?