Finsamandommon dimmeof mA P.ame6 3nmspectivelyFirst term and common di – InterviewSolution

1.

Finsamandommon dimmeof mA P.ame6 3nmspectivelyFirst term and common difference of an A.P. are 63 respecFind S27.

Answer»

Givena=6n=27d=3S27=?n=27

SOLUTIONS27=(n/2){2a+(n-1)d}=(27/2){2(6)+(27-1)(3)}=(27/2){12+26×3}=(27/2)(12+78)=(27/2)(90)=13.5×90=1215

ANSWER: Sn=1215

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