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Algebra

Hot goIITian

 Joined: 2 Apr 2009 Post: 115
7 Apr 2009 20:04:03 IST
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GUYS AND GALS LOOKIN FOR A TOUGH QUESTION
Engineering Entrance , JEE Main , JEE Advanced , Mathematics , Algebra

A and B r two 3X3 matricesand WHICH OF THE FOLLOWING ARE TRUE

1)=0

2)

3)

4)

Hot goIITian

Joined: 2 Apr 2009
Posts: 115
7 Apr 2009 20:38:29 IST
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HEY GUYS WAT HAPPENED NO ANS TILL NOWCOMON HELP ME DONT YOU WANT IIT

Cool goIITian

Joined: 11 Mar 2009
Posts: 78
7 Apr 2009 20:41:53 IST
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3rd and 4th look wrong as 4 is 8A and 3rd is not possible according to me it shud be B

Hot goIITian

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Posts: 115
7 Apr 2009 20:46:39 IST
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SORRY TO SAY BUT THE ANSWER U GAV IS WRONG JUST CHECK IT ONCE

Hot goIITian

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Posts: 115
7 Apr 2009 21:24:19 IST
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Blazing goIITian

Joined: 17 Mar 2008
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7 Apr 2009 21:33:21 IST
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look, |AB| = |A| |B| hence if |AB| = 0 it means at least one of |A| or |B| is zero. hence 1st option is true.

|B| =0 does not imply B=0 hence 2nd option is wrong

Blazing goIITian

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7 Apr 2009 21:34:44 IST
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4th option is wrong because |A+A| = 8|A|

Hot goIITian

Joined: 2 Apr 2009
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7 Apr 2009 21:41:01 IST
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ONCE AGAIN PLEASE YOU JUST FLEW OFF LIKE ANYTHING MISS SNEHA

New kid on the Block

Joined: 7 Apr 2009
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7 Apr 2009 21:42:47 IST
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i agree..Ans is A

Hot goIITian

Joined: 2 Apr 2009
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7 Apr 2009 21:45:42 IST
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SORRY IT IS A MULTIPLE OPTION

New kid on the Block

Joined: 7 Apr 2009
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7 Apr 2009 21:46:07 IST
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just confirming..is it that det(adjA)= |A|^n-1 where n is d order of [A]???

Hot goIITian

Joined: 2 Apr 2009
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7 Apr 2009 21:49:19 IST
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NO NO WAT I GAV IS CORRECT AM DAMN CONFIDENT ABT IT

New kid on the Block

Joined: 7 Apr 2009
Posts: 27
7 Apr 2009 21:50:35 IST
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no i m askin u abt a property of determinants..i don't have a source to check it out...

New kid on the Block

Joined: 7 Apr 2009
Posts: 27
7 Apr 2009 21:51:50 IST
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now i m sure...ans is A n Cn wat i asked u is correct

Hot goIITian

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7 Apr 2009 21:54:32 IST
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SORRY TO SAY BUT B IS ALSO THE ANSWER

New kid on the Block

Joined: 6 Mar 2009
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7 Apr 2009 22:12:59 IST
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converse of option (b) is correct, but the statement aint!

Blazing goIITian

Joined: 17 Mar 2008
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7 Apr 2009 22:22:21 IST
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