The sum of the non-prime numbers between 30 and 40, non-inclusive, is  Choose the correct choice from the following options.
A) 202  B) 217  C) 232  D) 247  E) 262

Rationale: "sum of consecutive integers from 31 to 39 , inclusive = = = = > ( a 1 + an ) / 2 * # of terms = ( 31 + 39 ) / 2 * 9 = 35 * 9 = 315 sum of non - prime numbers b / w 30 and 40 , non inclusive = = = > 315 - 68 ( i . e . , 31 + 37 , being the prime # s in the range ) = 247 answer : d"
Answer: D