The sum of the non-prime numbers between 50 and 60, non-inclusive, is
Answers
A) 263 B) 293 C) 323 D) 353 E) 383

Rationale: sum of consecutive integers from 51 to 59 , inclusive = = = = > ( a 1 + an ) / 2 * # of terms = ( 51 + 59 ) / 2 * 9 = 55 * 9 = 495 sum of non - prime numbers b / w 50 and 60 , non inclusive = = = > 495 - 112 ( i . e . , 53 + 59 , being the prime # s in the range ) = 383 answer : e
Answer: E