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12. How many terms of the A.P. 27, 24,s.hould be taken so that their sum iszero. |
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Answer» Given:a=27,d=-3, sn=0Formula :S=n/2(2a+(n-1) d) 0=n/2(2*27+(n-1) (-3))0=54-3n^23n^2=57n=19therefore no of terms =19 |
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