Question

... + n will be :
(a)
(A) Choose the correct answer:
(i) For all positive integers of n, the value of 1 + 2 + 3 + ..........
n(n+1) (2n+1)
6
n(n+1)
(b)
2
n(n-1)
2
n(n+1
(d)
2
(c)​

Answer 1

Answer:

N(n+1)

Hope u understand

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