3 and 4 .Determinants and Matrices
normal

જો $2A+B = \left[ {\begin{array}{*{20}{c}}
  1&0&3 \\ 
  { - 1}&4&6 \\ 
  2&5&2 
\end{array}} \right],\,A - 2B = \left[ {\begin{array}{*{20}{c}}
  2&{ - 1}&5 \\ 
  0&3&6 \\ 
  1&2&1 
\end{array}} \right]$ . તો  $Tr(A) -Tr(B)$ ની કિમત મેળવો.  (કે જ્યાં $Tr(A)$ એ શ્રેણિક $A$ ના વિકર્ણોના ઘટકોનો સરવાળો છે . )

A

$3$

B

$5$

C

$6$

D

$7$

Solution

$2Tr(A) + Tr(B) = 7$ and $Tr(A)\ -2Tr(B) = 6$ $\Rightarrow  Tr(A) = 4\ and\ Tr(B) =\ -1$

Standard 12
Mathematics

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