If integer k is equal to the sum of all even multiples of 15 between 390 and 615, what is the greatest prime factor of k?	Pick.
A) 5 B) 7 C) 8 D) 13 E) 17

Rationale: "if we break down what the stem is asking what is the sum of all mult of 30 between 390 and 600 . using arithmetic progression to find n : 600 = 390 + ( n - 1 ) 30 210 + 30 = 30 n 240 = 3 n = > n = 8 the sum would be : 8 * mean mean = [ 600 + 390 ] / 2 = 495 8 * 495 c"
Answer: C