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If A = [ [ 0 , 3 , -4 ] , [ k, 0 , 6 ]...

If `A = [ [ 0 , 3 , -4 ] , [ k, 0 , 6 ] , [ 4 , -6 , 0 ] ]` is skew symmetric matrix then the value of k is

( a )   -3   ( b )   3   ( c )   4   ( d )   -2

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