Math, asked by namrathameka2193, 11 months ago

If the sum to the first n terms of an AP is given by S = n(n + 1), find the 20th term of the AP.

Answers

Answered by GowriKrishna3

1

Answer:

Step-by-step explanation:

when n=1 then,

s=2

a=2

when n=2

s=6

d=6-2=4

∴ a=2 and d=4

a20= a+19d=2+76=78

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