The sum of all natural number between 100 to 200 which are multiple of
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Since number is not specified, we will take 7 as example.
have to find the sum of 105,112,119,126........196
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
have to find the sum of 105,112,119,126........196
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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