Find the sum of all 3 digit natural numbers, which are divisible by 8.  Choose the most appropriate option
A) 61376 B) 54411 C) 612314 D) 64170 E) 64171

Rationale: the three digit natural numbers divisible by 8 are 104 , 112 , 120 , … . 992 . let sndenote their sum . that is , sn = 104 112 120 128 , 992 g + + + + + . now , the sequence 104 , 112 , 120 , g , 992 forms an a . p . a = 104 , d = 8 , l = 992 n = l - a / d n = 112 s 112 = n / 2 ( a + l ) = 61376 option a
Answer: A