Question

Sum of n terms of a sequence is given by Sn = 2(n^2) - 2n. If it is an arithmetic progression, then find
its 20th term.​

Answer 1

Step-by-step explanation:

First term (a) =(2×1) - 2=0

Second term = sum of first 2 terms - first term

=(2×4) - ( 2×2) - 0=4

From this, d=4-0=4

We know, n th term=a+(n-1)d

Therefore, term20th=0+(20-1)4

=19×4

=76

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