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Let C be defined as the sum of all prime numbers between 0

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by BTGmoderatorDC » Tue May 07, 2019 9:05 pm

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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

Source: Princeton Review
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by Scott@TargetTestPrep » Fri May 10, 2019 4:37 pm
BTGmoderatorDC wrote: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

Source: Princeton Review
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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