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Bunuel
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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