[" The first term of an A.P.is "5" and t...

[" The first term of an A.P.is "5" and the last term is "45." If the sum of all the "],[" terms is "400" ,the number of terms is "],[[" (A) "20],[" (B) "8],[" (C) "10]]

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[" The first term of an A.P.is "5" and the last term is "45." If the sum of all the "],[" terms is "400" ,the number of terms is "],[[" (A) "20],[" (B) "8],[" (C) "10]]

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