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. Let a, b > 0 and vecalpha=hati/a+4hatj...

. Let a, b > 0 and `vecalpha=hati/a+4hatj/b+bhatk` and `beta=bhati+ahatj+hatk/b` then the maximum value of `30/(5+alpha.beta)`

A

`1`

B

`2`

C

`4`

D

`8`

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