[" 1.If "a(1),a(2),a(3),..." are in AP s...

[" 1.If "a_(1),a_(2),a_(3),..." are in AP such that "a_(1)+a_(7)+a_(16)=40" ,"],[" then the sum of the first "15" terms of this "AP" is "],[[" (i) "200," (b) "280," (c) "120," (2019Main,"12" Aprill "11)]]

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