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[" The first term of an A.P.is "5," the ...

[" The first term of an A.P.is "5," the last is "45" and their sum is "400" .If the number.of terms is "n" and "d" is the common "],[" to: "]

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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.