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Question

If A+2B=120633531 and 2AB=215216012, then tr(A)tr(B)=

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is B 2
tr(A)tr(B)=tr(AB)
AB=6AA5(3B+2B)5
AB=35(2AB)15(A+2B)
tr(AB)=35tr(2AB)15tr(A+2B)
tr(AB)=35(21+2)15(13+1)=9515=105=2

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