NDA Math Mock Test 02 – Question 34

Question:

If A and B are matrices of same order, then (AB’ − BA’) is a

यदि A और B समान कोटि के आव्यूह हैं, तो (AB’ − BA’) एक कैसा आव्यूह है?

Options:

  • skew-symmetric matrix
  • unit matrix
  • symmetric matrix
  • null matrix
  • विषम-सममित आव्यूह (skew-symmetric matrix)
  • इकाई आव्यूह (unit matrix)
  • सममित आव्यूह (symmetric matrix)
  • शून्य आव्यूह (null matrix)

Correct Answer: a)

Explanation:

Let \(C = AB’ – BA’\).
\(C’ = (AB’ – BA’)’ = (AB’)’ – (BA’)’ = (B’)’A’ – (A’)’B’ = BA’ – AB’ = -(AB’ – BA’) = -C\).
Since \(C’ = -C\), it is a skew-symmetric matrix.

माना \(C = AB’ – BA’\)।
\(C’ = (AB’)’ – (BA’)’ = BA’ – AB’ = -(AB’ – BA’) = -C\)।
चूँकि \(C’ = -C\) है, अतः यह एक विषम-सममित आव्यूह है।

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