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Question
If A = `[(1, 2),(2, 1)] and "B" = [(2, 1),(1, 2)]`, fin A(BA)
Solution
A = `[(1, 2),(2, 1)]`
B = `[(2, 1),(1, 2)]`
BA = `[(2, 1),(1, 2)] xx [(1, 2),(2, 1)]`
= `[(2 + 2, 4 + 1),(1 + 4 , 2 + 2)]`
= `[(4, 5),(5, 4)]`
A(BA) = `[(1, 2),(2, 1)] xx [(4, 5),(5, 4)]`
= `[(4 + 10, 5 + 8),(8 + 5, 10 + 4)]`
= `[(14, 13),(13, 14)]`.
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