CBSE Class 10 Answered
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Asked by | 17 Dec, 2008, 05:51: AM
Expert Answer
treat it as n A.P. with first term as 51 and common difference as -1.Then 21 will be the 31st term. So use the formula
Sum of an A.P. with first term as a and last term as l, where there are n terms is given by
S=n/2{a+l}
Answered by | 17 Dec, 2008, 07:55: AM
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