Let a place P contain two lines vecr ...

Let a place P contain two lines
`vecr = hati + lambda(hati + hatj), lambda in R` and
`vecr =-hatj + mu(hatj - hatk) , mu in R` .
If `Q(alpha, beta, gamma)` is the food of the perpendicular drawn from the point M(1,0,1) to P, then `3(alpha + beta + gamma)` equals ____________.

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