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The first term of an AP is 5, the last term is 45 and the sum is 400. Find the number of terms and the common difference,

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The first term of an AP is 5, the last term is 45 and the sum is 400. Find the number of terms and the common difference.
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Given, a = 5, l = 45, Sn = 400

To find: n and d

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