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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

यदि समीकरण निकाय \(k x + y +2 z =1\) ; \(3 x - y -2 z =2\) ; \(-2 x -2 y -4 z =3\) के अनन्त हल है, तो \(k\) बराबर है

  1. A \(21\)
  2. B \(42\)
  3. C \(14\)
  4. D \(28\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(21\)

Step-by-step Solution

Detailed explanation

We observe \(5 P _{2}- P _{1}=3 P _{3}\) So, \(15- K =-6\) \(\Rightarrow K =21\)
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