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Q.

Let An,(nN)be a matrix of order (2n1)×(2n1),such that aij=0ijand aij=n2+i+12n,i=jwhere aij denotes the element of ith row and jth column of An.

 Let Tn=-1n·sum of all the elements of An 

Find the value ofn=1102Tn520200, where [.] represents the greatest integer function.

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answer is 2.

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Detailed Solution

aij=0ij and aij=(n1)2+ii=j
Sum of all the element of An=i=12n1(n1)2+i
=(2n1)(n1)2+(2n1)n=2n33n2+3n1=n3+(n1)3
 So, Tn=(1)nn3+(n1)3=(1)nn3(1)n1(n1)3=VnVn1
n=1102Tn=n=1102VnVn1=V102V0=(102)3
n=1102Tn520200=2

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Let An,(n∈N)be a matrix of order (2n−1)×(2n−1),such that aij=0∀i≠jand aij=n2+i+1−2n,∀i=jwhere aij denotes the element of ith row and jth column of An. Let Tn=-1n·sum of all the elements of An Find the value of∑n=1102 Tn520200, where [.] represents the greatest integer function.