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Assertion (A) : If $A = [\begin{array}{rrr} x 3 - 10 \\ - 3 y 9 \\ 10 - 9 z \end{array}]$ ̧is askew symmetric matrix then Tr(A)=0
Reason (R) : If A is a skew symmetric then all the elements in a principal diagonal are equal to zero.

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Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true, R is false

A is false, R is true

answer is A.

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Detailed Solution

$A = [\begin{array}{r} x 3 - 10 \\ - 3 y 9 \\ 10 - 9 z \end{array}] i s s k e w s y m m e t r i c m a t r i x$
then x=y=z=0
tr(A)=x+y+z=0

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