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Question

If x is parallel to y and z where x=2^i+^j+α^k,y=α^i+^k and z = 5^i^j, then α is equal to


Your Answer
A
±5
Your Answer
B
±6
Correct Answer
C
±7
Your Answer
D
None of these

Solution

The correct option is C ±7
Given x is parallel to y and z
x.(y×z)=0[x  y  z]=0
∣ ∣21αα01510∣ ∣=0
α=±7.

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