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Q.

If vectors P→=ai^+aj^+3k^ and Q→=ai^−2j^−k^ are perpendicular to each other, then the positive value of a is

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a

3

b

1

c

2

d

0

answer is A.

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Detailed Solution

P→.Q→=(ai^+aj^+3k^).(ai^−2j^−k^)=0 Or a2−2a−3=0 ∴a=2±4+122=3

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