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Question

Let A=[1234] and B=[abcd] are two matrices such that AB = BA and c0, then value of ad3bc is :

A
2
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B
-2
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C
-1
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Solution

The correct option is C -1
AB=[1234][abcd]=[a+2cb+2d3a+4c3b+4d]BA=[abcd][1234]=[a+3b2a+4bc+3d2c+4d]
If AB = BA, then a + 2c = a + 3b
2c = 3b b0
b + 2d = 2a + 4b
2a - 2d = -3b
ad3bc=32b3b32b=1

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