यदि  है, तो  किसके बराबर होगा?

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NDA 02/2021: Maths Previous Year paper (Held On 14 Nov 2021)
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  1. Δ
  2. 72Δ
  3. -72Δ

Answer (Detailed Solution Below)

Option 4 : -72Δ
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Detailed Solution

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Concept:: 

  • The interchange of any two rows (or columns) of the determinant changes its sign.
  • The determinant remains unaltered if its rows are changed into columns and the columns into rows.

 

गणना:

C1 → C1 - 5C3, C2 → C- 7C3

Using the property of determinants

∴  A = -72Δ

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