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Q.

Let A=55αα0α5α005  .if |A2|=25 .then |α| equals

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a

15

b

5

c

52

d

1

answer is A.

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Detailed Solution

Given  A=55αα0α5α005and   |A2|=25 ∴   A2=55αα0α5α0052            ∴  A2=(25α)225=25 2a2⇒|α|=15
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