Question

-) Find the sum of all numbers from 150 to 200 which are divisible by 8
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Answer 1

Answer:

152,160,168,---------------200

a= 152

d = 8

an =200

an = a+(n-1)d

200 = 152+(n-1)8

48= (n-1)8

6 = (n-1)

n = 7

s7 = 7/2 (304+(6)8)

s7 = 7/2 (304+48)

s7 = 7/2 ×352

s7= 7×176

s7 = 1232