IIT JEE 2009 P2 Q20

The sum of first n terms of an AP is cn², Then the sum of squares of these n terms is

5 Answers

i got c

me too........

yups me too c

oh common guys...isko toh colce karna ka hint shortcut mei tha yaar...

for n=1.. first term is c ..so its square is c²

just put n= 1 in d answers den only 1 of dem mathches...i have even cheked by d elaborate method....

i also think c was mathcing..dun exactly remember...

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∑ ∑ ∑ ∑ ∑ ∮ ∮ ∮ ∮ ∮ ∏ ∏ ∏ ∏ ∏ ∐ ∐ ∐ ∐ ∐

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° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω