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Three forces vec(P) = c hat(i) + hat(j) ...

Three forces `vec(P) = c hat(i) + hat(j) - k, vec(Q) = -2 hat(i) + a hat(j), vec(R ) = hat(i) - 3 hat(j) + b hat(k)`. Act simultaneosly on a body to keep it is equilibrium. The product of [abc] is n/4 then find n

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