Question

If a=54 ,d=-3 ,an=0. Find n and sum of first n terms.

Can in this q we can find sum of first n terms as
Here n=19
Sn =n/2(2a+(n-1)d)
Sn=n/2(111-3n)
Sn=(111n-3n^2)/2

would I will get Mark's for it ​

Answer 1

Answer:

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Answer 2

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