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Q.

If the matrix 1−12321−1α3 is singular then α=

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a

2

b

-2

c

4

d

-4

answer is C.

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Detailed Solution

⇒6−α+1(9+1)+2(3α+2)=0⇒6−α+10+6α+4=0⇒5α+20=0⇒α=−4
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