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Suppose alphai+ alpha j + gamma k, i + k...

Suppose `alphai+ alpha j + gamma k, i + k and gammai + gamma j + beta k ` are coplanar where `alpha ,beta and gamma` are positive constants. Then the product `alpha beta` is

A

a) `gamma`

B

b) `-gamma^(2)`

C

c) `2 gamma`

D

d) `2 gamma^(2)`

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