Disucss Test Questions - Test:80 QNo:8

30

Ashish Kothari ·2010-09-16 02:37:06

a) n(n+1)(2n+1)/6
b) n(2n²-1)
c) n²(2n²-1)
d) n²(n+1)(2n+1)/6

should the answer be n²(n+1)(2n+1)/6 ?

Answer given is c)

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1

Euclid ·2010-09-16 04:09:42

i m getting n(4n²-1)3..:(

how did u get ur ans?? plzz xplain

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23

qwerty ·2010-09-16 04:26:24

i m getting n(4n²-1)3

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Euclid ·2010-09-16 04:28:04

oops yes ryt.... there was a typing error...me too.... edited....

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30

Ashish Kothari ·2010-09-17 07:44:04

Actually yeah, on solving thats what I'm getting.. But, during the test I didnt solve.. I did it by the method of elimination.. And only option d) is valid to get the desired result.. Like putting values n=1 and n=2.. We can see that only d) holds..

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23

qwerty ·2010-09-17 21:34:46

put n = 3 , option d aint valid

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