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