Question

1. The sum of 1 + n 1
--(-5) (1-5) =
n(n+1)
2!
+ .... will
be​

Answer 1

Answer:

3.16

Step-by-step explanation:

1+n1--(-5)(1-5)= n(n+1)

1+n1+(-5)(-4) = n^2+1

1+n1-5×-4 = n^2+1

1+n1+20 = n^2+1

n1-n^2 = 1-1-20

-2n^2 = -20

n^2 = -20/-2

n^2 = 10

n = √10

n = 3.16

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