If the vectors vec(P)=a hat(i)+a hat(j)+3hat(k) and vec(Q)=a hat(i)-2hat(j)-hat(k) are perpendicular to each other then the positive value of .a. is

If the vectors vec(P)=a hat(i)+a hat(j)+3hat(k) and vec(Q)=a hat(i)-2h

1.	If the vectors vec(P)=a hat(i)+a hat(j)+3hat(k) and vec(Q)=a hat(i)-2hat(j)-hat(k) are perpendicular to each other then the positive value of .a. is
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