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Q.

If three vectors along coordinate axis represent the adjacent sides of a cube of length b, then the unit vector along its diagonal passing through the origin will be

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a

i^+j^+k^2

b

i^+j^+k^36

c

i^+j^+k^

d

i^+j^+k^3

answer is D.

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Detailed Solution

Diagonal vector, A=bi^+bj^+bk^A=b2+b2+b2=3bA^=AA=i^+j^+k^3
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