Question

In an A.P first term is 0 and the last term is 40 .Then what is sum of all terms is when n =20
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Answer 1

Answer:

400

Step-by-step explanation:

as sn =n/2(2a+(n-1)d)

Answer 2

Answer:

400

Step-by-step explanation:

Given first term is (a) =0

Last term (l) =40

n=20

Sum of AP=n/2 (a+l)

= 20/2 (0+40)

=10(40)

=400

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