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The sum of the non-prime numbers between 40 and 50, non-inclusive, is

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The sum of the non-prime numbers between 40 and 50, non-inclusive, is  [#permalink]

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New post 12 Aug 2016, 09:04
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

75% (01:28) correct 25% (01:15) wrong based on 83 sessions

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Re: The sum of the non-prime numbers between 40 and 50, non-inclusive, is  [#permalink]

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New post 12 Aug 2016, 09:11
The sum of the non-prime numbers between 40 and 50, non-inclusive, are {42, 44, 45, 46, 48, 49}. 6 times 40 something is approx north of 240 and Hence the answer is (C) 274
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Re: The sum of the non-prime numbers between 40 and 50, non-inclusive, is  [#permalink]

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New post 12 Aug 2016, 10:33
1
Bunuel wrote:
The sum of the non-prime numbers between 40 and 50, non-inclusive, is

A. 131
B. 176
C. 274
D. 405
E. 495


Once we get the Non prime numbers, no need to sum all. Just find the sum of Unit digits, we will get 4 at the end. Hence, answer C
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Re: The sum of the non-prime numbers between 40 and 50, non-inclusive, is  [#permalink]

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New post 12 Aug 2016, 12:09
1
Bunuel wrote:
The sum of the non-prime numbers between 40 and 50, non-inclusive, is

A. 131
B. 176
C. 274
D. 405
E. 495


sum of consecutive integers from 41 to 49, inclusive ====> (A1 + An)/2 * # of terms = (41 + 49)/2 * 9 = 45 *9 = 405

sum of non-prime numbers b/w 40 and 50, non inclusive ===> 405 - 131 (i.e., 41 + 43 +47, being the prime #s in the range) =274

Answer: C
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Re: The sum of the non-prime numbers between 40 and 50, non-inclusive, is  [#permalink]

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New post 09 Mar 2019, 01:52
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Re: The sum of the non-prime numbers between 40 and 50, non-inclusive, is   [#permalink] 09 Mar 2019, 01:52
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