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Q.

The rank of the matrix−1232−4a−11−2a+2  is 1 If

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a

a=1

b

a=−2

c

a=−5

d

a=5

answer is C.

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Detailed Solution

[−1232−4a−11−2a+2R2+2R1R3+R1~−12300a+500a+5⇒a+5=0⇒a=−5
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