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Let us consider the prime numbers less than 10
2,3,5,7

if we look at the options
a) 2*3 = 6 ---> Wrong
b) To get 9, we need 3 and 3. ---> Correct
c) 2*5 = 10 ---> Wrong
d) 7*2 = 14 ---> Wrong
e) 3*5 = 15 ---> Wrong

Answer B
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Bunuel
If f and g are distinct prime numbers less than 10, which of the following cannot be the product of f and g?

A. 6
B. 9
C. 10
D. 14
E. 15
Solution:

We see that f x g can’t be 9 since 9 = 1 x 9 or 9 = 3 x 3. In the former case, neither factor is prime. In the latter case, both factors are primes, but they are not distinct.

Answer: B
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