Find sum of all numbers divisible by 7 between 100 and 200

Ans-2107.

Explanation:

Indirectly we have to find the sum of 105,112,119,126196

now lets find total no. of terms in this A.P.

196=105+(n-1)*7

n-1 = 91/7

n=14

now total sum S= 7[2*105 + (14-1)*7]

S= 7[210+91]

S=7*301

S=2107

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