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  1. Chapter 10 Class 12 Vector Algebra
  2. Serial order wise
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Ex 10.5, 1 (Supplementary NCERT) Find [ " " " " ] if = 2 + 3 , = 2 3 + , = 3 + 2 Given, = 2 + 3 , = 2 3 + , = 3 + 2 .( ) = [ " " " " ] = | 8(1& 2&3@2& 3&1@3&1& 2)| = 1[( 3 2) (1 1) ] ( 2)[(2 2) (3 1) ] + 3[(2 1) (3 3)] = 1 [6 1]+2( 4 3)+3[2+9] = 1(5) + 2( 7) + 3(11) = 5 14 + 33 = 38 14 = 24 [ " " " " ] = 24

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.