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

[" 10.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 "],[" 11The 9th torm of tha "/_" p "-15" ."11" - "7]

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