Number N is randomly selected from a set of all primes between 10 and 40, inclusive. Number D is selected from a set of all multiples of 5 between 10 and 40 inclusive. What is the probability that N+D is odd? Options:
A) 1/2  B) 2/3  C) 3/4  D) 4/7  E) 5/8
All primes except 2 are odd, thus N must be odd. For N + D = odd + D to be odd, D must be even.   There are 7 multiples of 5 between 10 and 40, inclusive: 10, 15, 20, 25, 30, 35, and 40. Out of them 3 (15, 25, and 35) are odd.   Therefore the probability that N + D is odd is 4/7.   Answer: 4/7.
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Number N is randomly selected from a set of all primes between 10 and 40, inclusive. Number D is selected from a set of all multiples of 5 between 10 and 40 inclusive. What is the probability that N+D is odd?