1 . What is the probability that product of two integers (not necessarily different integers ) randomly selected from the numbers 1 to 20, inclusive , is odd ?

• A. 1/3
• B. 1/4
• C. 1/2
• D. 1/5

Answer: Option B

Explanation:

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.