Question

Find the sum of the integers between 100 and 200 that are (a)divisible by 3 (b)not divisible by 3

Answer 1

i think the answer is (b)

Answer 2

(a)

First, find the first and last integer between 100 and 200 that are divisible by 3.

102 and 198. Then find the number of integers between these two numbers, inclusive, that are divisble by 3.

198 - 102 = 96

96 / 3 = 32 integers that are divisible by 3.

But, add one before you're done since it's inclusive.

32 + 1 = 33

(b) To find sum of nos. between 100 and 200 apply on this formula:

sum of number between 100 and 200 which are not divisible by 3 = (sum of numbers between 100 and 200) - (sum of number which are divisible by 3 between 100 and 200)

And you will get the answer.....

Hope it helps.....