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If A and B are matrices such that AB = O...

If A and B are matrices such that AB = O then

A

`A=O,B!=O`

B

`A!=O,B=O`

C

`A=O,B=O`

D

A, B need not be null matrices

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The correct Answer is:
D
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AAKASH SERIES-MATRICES -ALGEBRA OF MATRICES -EXERCISE - I
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  11. If the traces of A are 19 and B are 8 then the trace of A-B is

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  12. If tr(A)=2+i then tr((2-i)A)=

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  13. If tr(A)=3,tr(B)=5 then tr(AB)=

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  14. If A=[(4,x+2),(2x-3,x+1)] is symmetric then trace of A is

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  15. If A=[(x,1,4),(-1,0,7),(-4,-7,0)] such that A'=-A then x=

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  18. If A=[(cos theta, sin theta, 0),(-sin theta, cos theta, 0),(0,0,1)] th...

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