Question

Which of these sets consists entirely of prime numbers?
Select one of the options below as your answer:

A.
3, 6, 9, 12, 15
B.
4, 8, 12, 16, 20
C.
3, 5, 7, 11, 13
D.
3, 5, 7, 9, 11

Answer 1

Do you know what prime numbers are? The question is just a matter of searching through each answer and eliminating it if it has non-primes... so look for easy answers like evens (all evens above 2 cannot be prime since they're divisible by 2), or numbers divisible by 3 (like 3, 6, 9, 12...).

Only one answer above doesn't have one of these non-prime numbers. (hint: it's C).

Let me know if you don't get the prime number concept though... this one should be easy.

Answer 2

Its D

Answer 3

D includes 9, and 9 is divisible by 3, so it isn't prime.

Answer 4

Answer D is in there to trick you, since 9 is "hidden" in with other primes

Answer 5

A

Answer 6

NO ITS B

Answer 7

lol - its c