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# Find the sum of the first n terms of the following A.P. as asked for: up to 18 terms

Formula used.

Sn = [2a + (n–1)d]

d = an + 1–an

In the following A.P

a = ,

d = a2–a1

= = 1;

n = 18

Sn = [2a + (n–1)d]

= [2× + (18–1)1]

= 9[ + 17]

= 9[]

= 159

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