Question

find the sum of the A.P with first term 1 , common difference 3, last term 100

Answer 1

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Answer 2

a = 1
d = 3 -
l = 100 = a +(n -1)d
     100 = 1 +(n-1)3
     100 = 1 + 3n - 3
     100 + 2= 3n
           n = 34

Sn = n/2(a + l)
Sn = 34/2(1 + 100)
Sn = 17*101
Sn = 1717