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If a and b are two vectors such that 2a+...

If a and b are two vectors such that `2a+b=e_(1)" and "a+2b=e_(2)`, where `e_(1)=(1, 1, 1)" and "e_(2)=(1,1,-1)`, then the angle between a and b is

A

`cos^(-1) ((7)/(9))`

B

`cos^(-1) ((7)/(11))`

C

`cos^(-1) (-(7)/(11))`

D

`cos^(-1) (-(7)/(9))`

Text Solution

Verified by Experts

The correct Answer is:
C
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