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Find the sum to n terms of the series 1 ...

Find the sum to n terms of the series `1 + (1 + 2) + (1 + 2 + 3) + ......`

A

`(1)/(2)n(n+1)(n+2)`

B

`(1)/(3)n(n+1)(n+2)`

C

`(1)/(4)n(n+1)(2n+1)`

D

`(1)/(6)n(n+1)(n+2)`

Text Solution

Verified by Experts

The correct Answer is:
D
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MCGROW HILL PUBLICATION-PROGRESSIONS-EXERCISES LEVEL-1 (Single Correct Answer Type Questions)
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  6. Find the sum to n terms of the series 1 + (1 + 2) + (1 + 2 + 3) + .......

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  10. If the fifth term of a G.P. is 2, then write the product of its 9 t...

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  11. If s is the sum to infnity of a G.P, whose first term is a, then the s...

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  14. The H.M. between two numbers is 16/5, their A.M. is A and G.M. is G. I...

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  16. If A=1+r^2+r^(2a)+...oo=a and B=1+r^b+r^(2b)+...oo=b then a/b is equal...

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  17. Suppose a(1)=45, a(2)=41 and a(k)=2a(k-1)-a(k-2) AA k ge 3, then, valu...

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  18. Suppose P(x)=1-x+x^(2)-x^(3)+…+x^(2012) is expressed as a polynomial i...

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