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Given, l=4,d=2 and Sn =-14,find n and a. |
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Answer» An=a+(n-1)d=4Or,a+(n-1)2=4a+2n-2=4a+2n=6a=6-2nThen, Sn=n/2[2a+(n-1)d]=-14 Hlw |
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