Q 1565401365.     If `r=alpha(bxxc)+ b eta(cxxa)+gamma(axxb)` and `[abc]=2`,

then `alpha + beta + gamma` is equal to

VIT 2014
A

`r · [bxx c+ cxx a+ a xx b]`

B

`1/2r .(a+b+c)`

C

`2r .(a+b+c)`

D

`4`

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