if the nth term of an ap be 2n-1,then the sum of its frist n terms will be
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Answer:
firstly put N=1,2,3
Step-by-step explanation:
we get 1,3 as a1 and a2
by a2-a1 we find D
3-1=2
so, d is =2
put a and d in sum formula
n/2(2a+(n-1)d)
n/2(2(1)+(n-1)2)
n/2(2+2n-2)
n(2n)/2
so , we get n^2
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