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The sum of 10 terms of the series whose n th terms is n 2 -5. Please help.

The sum of 10 terms of the series whose nth terms is n2 -5. Please help.

Grade:12

1 Answers

P S S C ASLESH
35 Points
2 years ago
nth term of the series is n²-5
Sum of n terms=∑(n²-5)=∑n²-5
=n(n+1)(2n+1)/6 -5
n=10
Sum of 10 terms = 10(10+1)((2*10)+1)/6 -5
=(10*11*21)/6 -5
=2310/6 -5
=385-5
=380

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