If the resultant of three forces `vec(F)_(1)=phat(i)+3hat(j)-hat(k),vec

If the resultant of three forces `vec(F)_(1)=phat(i)+3hat(j)-hat(k),vec(F)_(2)=-5hat(i)+hat(j)+2hat(k)` and `vec(F)_(3)=6hat(i)-hat(k)` acting on a particle has magnitude equal to 5 units, then the value (s) of p is (are)