InterviewSolution
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InterviewSolution
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If `D_(r) = |(r,1,(n(n +1))/(2)),(2r -1,4,n^(2)),(2^(r -1),5,2^(n) -1)|`, then the value of `sum_(r=1)^(n) D_(r)`, is |
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Answer» Correct Answer - A We have, `underset(r=0)overset(n)sum D_(r) = |(underset(r =1)overset(n)sum r,1,(n(n +1))/(2)),(underset(r=1)overset(n)sum 2r -1,4,n^(2)),(underset(r =1)overset(n)sum 2^(r -1),5,2^(n) -1)|` `rArr underset(r =0)overset(n)sum D_(r) = |((n(n +1))/(2),1,(n(n+1))/(2)),(n^(2),4,n^(2)),(2^(n) -1,5,2^(n) -1)| =0` |
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