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Discussion

General MCA Entrance Discussion
(74)

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The sum of 2n terms of the series 12 - 22 + 32 - 42 + 52 - 62 +.......... is

 
-2n(4n + 1)
n ( n + 1 ) 2
- n(n + 1)
n2

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Madhukul

(1-2)(1 2) (3-4)(3 4)..............nterms.i.e-1*(1 2 3 ...nterms) #ans=-(n)(n 1)/2

Nitish Kumar

Its wrong answer .. correct answer will be -m(2m 1) , where m =2n

Sourabh

TAKE N=5 AND PUT IN THE 1 FORMULA IT WILL GIVE U RIGHT ANSWER.

ROJA

Want a correct explanation for dis quesn

Debanjan Chanda

Can somebody please explain this answer ? :|