Q13 of 23 Page 3

If and then find

a11 b11 + a22 b22 (CBSE 2016)

A = [aij] = …......(1)

B = [bij] = …......(2)


Given, A = [aij] = B = [bij] =


Now, Comparing with equation (1) and (2)


a11 = 2, a22 = 4, b11 = 2, b22 = 4


a11 b11 + a22 b22 = 2 × 2 + 4 × 4 = 4 + 16 = 20

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