Questions
Let A be 3×3 matrix such that A is orthogonal and idempotent, then
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a
A must be symmetric
b
det(A)=−1
c
A+A−1=1
d
none of these
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Correct option is A
AA′=I and A2=I∴AA′=A2⇒A−1AA′=A−1A2⇒A′=ASimilar Questions
Let A be an invertible matrix. Which of the following is not true?
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