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Let u=5a + 6b + 7c, v =7a - 8b + 9 c an...

Let `u=5a + 6b + 7c, v =7a - 8b + 9 c and w =3 a + 20 b + 5c`, where `a, b and c` are non-zero vectors. If `u = lv + mw`, then the values of `l and m` respectively are

A

`(1)/(2) , (1)/(2)`

B

`(1)/(2) , - (1)/(2)`

C

`- (1)/(2) , (1)/(2)`

D

`(1)/(3) , (1)/(3)`

Text Solution

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The correct Answer is:
A
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