Question

6.
Two vectors P=2i+bi+2k and Q = i +i+k will be parallel if
(1) b=0
(2) b=1
(3) b=2
(4) b=-4
explain?
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Answer 1

2/1=b/1=2/1

so b=2

it is your answer

Answer 2

so the answer is  b=2