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How many positive integers less than 25 are neither prime n

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by Brent@GMATPrepNow » Fri Apr 05, 2013 6:25 am
varun289 wrote:How many positive integers less than 25 are neither prime numbers nor multiples of 3 ?
A

11
B

10
C

9
D

8
Listing is the only approach: 1, 4, 8, 10, 14, 16, 20, 22 (total = 8)

Note: zero is not positive.

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by Anju@Gurome » Fri Apr 05, 2013 6:27 am
varun289 wrote:How many positive integers less than 25 are neither prime numbers nor multiples of 3 ?
The numbers are 1, 4, 8, 10, 14, 16, 20, and 22
[spoiler]
The correct answer is D.[/spoiler]
Anju Agarwal
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