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[" 7.If "a(1),a(2),a(3),...." are in "A....

[" 7.If "a_(1),a_(2),a_(3),...." are in "A.P." such that "a_(1)+a_(7)],[+a_(16)=40," then the sum of the first "15" terms of "],[" this A.P.is : "],[[" (1) "150," (2) "280],[" (3) "200," (4) "120]]

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