Fewpal
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If a and l be the first and last term of an ap and S be the sum of its all terms then its common difference is

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Let the common difference and number of terms of A.P. be d and n respectively.

∴ Last term of A.P. = n th of the A.P., an

⇒ a l(Given)

Sum of n terms of A.P. = S (Given)

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