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If A=[a(i j)]=[(2, 3,-5),( 1, 4, 9),( 0,...

If `A=[a_(i j)]=[(2, 3,-5),( 1, 4, 9),( 0, 7,-2)]` and `B=[b_(i j)]=[(2,-1),(-3, 4),( 1, 2)]` then find `a_(22)+b_(21)` (ii) `a_(11)b_(11)+a_(22)b_(22)`

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`a_(22)+b_(21)=4-3=>1`
`a_(11)b_(11)+a_(22)b_(22)=4+16=>20`
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