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Let C be defined as the sum of all prime numbers between

Expert replies
Source: — Problem Solving |

by Brent@GMATPrepNow » Fri Dec 07, 2018 6:10 am
AAPL wrote:Princeton Review

Let C be defined as the sum of all prime numbers between 0 and 30. What is C/3?

A. 155
B. 129
C. 61
D. 47
E. 43
C = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29
= 129


So, C/3 = 129/3 = 43

Answer: E

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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by Scott@TargetTestPrep » Thu Mar 21, 2019 4:44 pm
AAPL wrote:Princeton Review

Let C be defined as the sum of all prime numbers between 0 and 30. What is C/3?

A. 155
B. 129
C. 61
D. 47
E. 43

OA E
The sum of the prime numbers from 0 to 10 is:

2 + 3 + 5 + 7 = 17

The sum of the prime numbers from 11 to 20 is:

11 + 13 + 17 + 19 = 60

The sum of the prime numbers from 21 to 30 is:

23 + 29 = 52

So C/3 = (17 + 60 + 52)/3 = 129/3 = 43.

Answer: E

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