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If the vectors vec(a)= hat(i)- hat(j) + ...

If the vectors `vec(a)= hat(i)- hat(j) + 2hat(k), vec(b)= 2hat(i) +4 hat(j) + hat(k) and vec(c )= lamda hat(i) + 9hat(j)+ mu hat(k)` are mutually orthogonal, then `lamda+mu` is equal to a)5 b)-9 c)-1 d)0

A

5

B

`-9`

C

`-1`

D

0

Text Solution

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The correct Answer is:
B
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