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NDA 2026
Exam
NDA
Year
2026
Subject
Mathematics
Chapter
Determinants

NDA 2026 · Mathematics · Determinants

If A is a square matrix such that |A|=-2 , then |AA^ T | , where A^...

If AA is a square matrix such that ∣A∣=−2|A|=-2, then ∣AAT∣|AA^{\text{T}}|, where ATA^{\text{T}} is the transpose of AA, is equal to

Options

  1. A−4-4
  2. B11
  3. C22
  4. D44

Correct answer

D. 44

Step-by-step solution

Using the property of determinants, ∣AB∣=∣A∣∣B∣|AB| = |A||B|.

Therefore, ∣AAT∣=∣A∣∣AT∣|AA^{\text{T}}| = |A||A^{\text{T}}|.

Since the determinant of a matrix is equal to the determinant of its transpose, ∣AT∣=∣A∣|A^{\text{T}}| = |A|.

Substituting this into the equation gives ∣AAT∣=∣A∣∣A∣=∣A∣2|AA^{\text{T}}| = |A||A| = |A|^2.

Given ∣A∣=−2|A| = -2, we get ∣AAT∣=(−2)2=4|AA^{\text{T}}| = (-2)^2 = 4.

Answer: 44
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