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Question

The rank of the matrix 12524a412a+1 is

A
1 if a=6
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B
2 if a=1
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C
3 if a=2
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D
1 if a=6
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Solution

The correct option is D 1 if a=6
12524a412a+1
R2R2+2R1,R3R3+R1
12500a+600a+6
R3R3R2
12500a+6000
Rank=1 if a=6
Rank=2 if a6.

1104377_1196556_ans_409c40a0d60348da8fade844817ede86.jpg

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