Ex 4.2, 3 - Prove using property |2 7 65 3 8 75 5 9 86| = 0 - Ex 4.2

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  1. Chapter 4 Class 12 Determinants
  2. Serial order wise
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Ex 4.2, 3 Using the property of determinants and without expanding, prove that: 2 7 65 3 8 75 5 9 86 = 0 2 7 65 3 8 75 5 9 86 Applying C3 C1 = 2 7 65 2 3 8 75 3 5 9 86 5 = 2 7 63 3 8 72 5 9 81 = 2 7 7 3 8 8 5 9 9 Taking out 9 common from C3 = 9 2 7 7 3 8 8 5 9 9 Here, R2 & R3 are identical = 9 0 = 0 Thus, 2 7 65 3 8 75 5 9 86 = 0 Hence proved

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