3 and 4 .Determinants and Matrices
medium

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

A

$21$

B

$42$

C

$14$

D

$28$

(JEE MAIN-2021)

Solution

We observe $5 P _{2}- P _{1}=3 P _{3}$

So, $15- K =-6$

$\Rightarrow K =21$

Standard 12
Mathematics

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