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Q.

If a¯ = 3i¯ + 2j¯ + k¯, b¯ = 6i¯ + mj¯ + nk¯  are collinear, then m, n are

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a

m = 2, n = 10

b

m = 10, n = 2

c

m = 4 , n = 2

d

m = 2, n = 4

answer is C.

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Detailed Solution

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a¯ = 3i¯ + 2j¯ + k¯  b¯ = 6i¨ + mj¯ + ak¯  are collinear

 36 = 2m = 1n   m = 4, n = 2

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If a¯ = 3i¯ + 2j¯ + k¯, b¯ = 6i¯ + mj¯ + nk¯  are collinear, then m, n are