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Extraction of Aluminium

For an A.P. t...

Question

For an A.P. t_n=2n+3, what is the formula for S_n?

n(n+1)

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n(n-1)

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n(n-4)

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n(n+4)

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Solution

The correct option is D
n(n+4)

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T_{n} = 6 n + 5

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\frac{t_{m}}{t_{n}} =

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(t_{n}), S_{n} = 4 n^{2} - 3 n

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