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If a = i - j + 2k, b = 2i + 3j + k, c = ...

If `a = i - j + 2k, b = 2i + 3j + k, c = i - k`, then magnitude of `a + 2b-3c` is

A

`sqrt(87)`

B

`sqrt(78)`

C

`sqrt(89)`

D

`sqrt(101)`

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-ADDITION OF VECTORS -EXERCISE 1
  1. If a = 2i + 5j + 6k, b = -2i + 3j + 2k then the magnitude of a - b is

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  2. If a = 3i - 2j + k, b = 2i - 4j - 3k, c = -i + 2j + 2k then a + b + c ...

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  3. If a = i - j + 2k, b = 2i + 3j + k, c = i - k, then magnitude of a + 2...

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  4. If a = i + j + k, b = 2i + 3j, c = 3i + 5j - 3k and d = k + j, then th...

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  5. If the position vectors of A, B are 2i - 9j - 4k, 6i - 3j + 8k then th...

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  6. If the position vectors of A = (2, 3, 5), B = (1, 1, 7) then the unit ...

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  7. If a = 3i - 2j + k, b = -i + j + k then the unit vector parallel to th...

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  8. If a = 3i - 2j + k and b = i + 2j + 5k, then the unit vector along a -...

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  9. If a = i + j - 2k, b = -i + 2j + k, c = i - 2j + 2k, then a unit vecto...

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  10. If a = i + j, b = j + k and c = i + k then a unit vector in the direct...

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  11. If lambda (2i - 4j + 4k) is a unit vector then lambda =

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  12. If the vector a = 2i + 3j + 6k and b are collinear and |b| = 21, then ...

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  13. If 2i + 3j - 6k, 6i - 2j + 3k, 3i - 6j - 2k represent the sides of a t...

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  14. The points whose position vectors are 2i + 3j + 4k, 3i + 4j + 2k and 4...

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  15. The three points whose position vectors are i + 2j + 3k, 3i + 4j + 7k ...

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  16. The points whose position vectors are 2i + 3j + 4k, 3i + 4j + 2k and 4...

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  17. If the position vectors of the vertices of a triangle are 2i - j + k, ...

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  18. The points (1,1 ,1 ) ,(1,2,3 ),(2-1, 1 ) form

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  19. The points 2a + 3b + c, a + b, 6a + 11b + 5c are

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  20. The points 2i + j + k, 6i - j + 2k, 14i - 5j + 4k are

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