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If A=[(1,0,2),(-1,1,-2),(0,2,1)]" and Ad...

If `A=[(1,0,2),(-1,1,-2),(0,2,1)]" and Adj "A=[(5,a,-2),(1,1,0),(-2,-2,b)]`, then the values of a and b are -

A

a=-4, b=1

B

a=-4, b=-1

C

a=4, b=1

D

a=4, b=-1

Text Solution

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The correct Answer is:
C
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CHHAYA PUBLICATION-MCQ ZONE -Question Paper 2
  1. The angle between the pair of straight lines whose direction cosines a...

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  2. If A and B are two events such that P(A cup B)=(5)/(6), P(A cap B)=(1)...

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  3. If A=[(1,0,2),(-1,1,-2),(0,2,1)]" and Adj "A=[(5,a,-2),(1,1,0),(-2,-2,...

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  4. If the straight lines (x-2)/(a)=(y+3)/(-4)=(z-2)/(3) and (x+2)/(3)=(y...

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  5. The coordinates of the point where the line (x-3)/(1)=(y-4)/(2)=(z-5)...

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  6. If a=1+2+4+… to n terms, b=1+3+9… to n terms and c=1+5+25+… to n term...

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  7. The distance between the point (-1, -5, -10) and the point of interse...

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  8. If the direction ratios of two lines are 2, -3, 6 and 1, -2, 2 respect...

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  9. A coin and a six faced die, both unbiased, are thrown simultaneously....

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  10. A number is chosen at random among the first 120 natural numbers. What...

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  11. If A=((-1,0),(0,2)) then the value of A^(3)-A^(2) is equal to -

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  12. If 1, omega,omega^(2) are the cube roots of unity then the vlue of m f...

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  13. If A=[(-x,-y),(z,t)], then the transpose of adj A is -

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  14. A die is thrown if it shows a six, we draw ball from is bag containing...

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  15. The solutions of the equation |(x,2,-1),(2,5,x),(-1,2,x)|=0 are -

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  16. The vector of magnitude 12, which is perpendicular to both the vect...

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  17. If A is a square matrix of order 3xx3 and lambda is a scalar, then adj...

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  18. If veca, vecb,vec c are unit vectors such that veca+vecb+vec c=veco, t...

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  19. The points with position vectors 60hati+3hatj, 40hati-8hatj and a hat...

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  20. If the diagonals of a parallelogram are 3hati+hatj-2hatk and hati-3hat...

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