Others Maths Puzzle

Two canoe riders must be selected from each of the two groups of campers. One group consists of three men and one woman, and the other group consists of two women and one man. What is the probability that two women and two men will be selected?
a) 1/6 b) 1/4 c) 2/7 d) 1/2

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Others Other Question

For positive integers n, denote by D(n) the number of pairs of di erent adjacent digits in the binary (base two) representation of n. For example, D(3) = D(112) = 0, D(21) = D(101012) = 4, and D(97) = D(11000012) = 2. For how many positive integers n less than or equal to 97 does D(n) = 2? (A) 16 (B) 20 (C) 26 (D) 30 (E) 35 Q1. How many number having atmost 6-digits and sum of the digits atmost 6 are possible ??