Question

find the sum of all intigers between 100 and 200 divisible by 7​

Answer 1

Step-by-step explanation:

a=105

nth term = an= 196

d = 7

an = a+ (n-1)d

=> 196 = 105 + (n-1) 7

=> 91 = (n-1) 7

=> (n-1) = 13

=> n = 14

sum = sn = (n/2)(a+an) = (14/2) (105+196) = 7 × 301 = 2107

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