Qualification > Math

can someone answer this maths question in paper 4

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thukon:

--- Quote from: Name on May 19, 2009, 07:04:25 am ---
--- Quote from: unknown on May 19, 2009, 06:38:54 am ---hey even i cldnt get it bt then finally i did wth d subsitution method to prove tht it was (n+1)^2 n ya i gues i can achieve marks by tht method 2 n dam i m worried fr probabaility i messed it up n ya wht is d % ans of tht sphere..... ???

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i thought there was some mistake in the "show clearly that the sum is (n+1) squared :S
and for the precentage of the sphere, i got 502%!!!

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For the percentage of the sphere i got 4 hundred something. And the nth term is easy. You have to prove that the nth TERM plus the nth+1 TERM = n(NOT TERM)^2. So the 2nd term was 3 and the 3rd term was 6 so   3+6=(2+1)^2

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