Q .     Let `alpha, beta, gamma` and `delta` are four positive real number such that their product is unity, then the least value of

`(1 +alpha) (1+beta) (1+gamma)(1 + delta)` is :

BITSAT 2005
A

`6`

B

`16`

C

`0`

D

`32`

HINT

we know `AM >= GM` `=> (1+alpha)/2 >= sqrtalpha` `=> 1+ alpha >= 2sqrtalpha`

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