What is the probability that the product of two integers ( not necessarily different integers ) randomly selected from the numbers 1 through 20, inclusive , is odd ?
A
2/3
B
1/4
C
1/2
D
3/4
Correct Answer: 1/4
Total integers; 20 even = odd = 10 Since odd x odd = odd and since half the integers 1 to 20 are odd, the probability of selecting two odd integers is 1/2 x 1/2 = 1/4.