If vectors `ahat(i)+hat(j)+hat(k),hat(i)+bhat(j)+hat(k),hat(i)+hat(j)+chat(k)` are coplanar, then `a+b+c-abc= . . . . . . . .`

If the vectors ahat(i)+hat(j)+hat(k), hat(i)+bhat(j)+hat(k), hat(i)+hat(j)+chat(k) , where a, b, c are coplanar, then a+b+c-abc=

If the vectors ahat(i)+hat(j)+hat(k), hat(i)+bhat(j)+hat(k), hat(i)+hat(j)+chat(k) , where a, b, c are coplanar, then a+b+c-abc=

If the vectors ahat(i)+hat(j)+hat(k), hat(i)+bhat(j)+hat(k), hat(i)+hat(j)+chat(k) , where a, b, c are coplanar, then a+b+c-abc=

If the vectors ahat(i)+ahat(j)+chat(k),hat(i)+hat(k) and chat(i)+chat(j)+bhat(k) are coplanar then show that c^(2)=ab

If the vectors hat(i)-2hat(j)+hat(k),ahat(i)+5hat(j)-3hat(k)and5hat(i)-9hat(j)+4hat(k) are coplanar, then the value of a is

If vector hat(i)+hat(j)+hat(k), hat(i)-hat(j)+hat(k) and 2hat(i)+3hat(j)+lambda hat(k) are coplanar, then lambda is equal to

If the vectors ahat(i)+hat(j)+hat(k), hat(i)+bhat(j)+hat(k), hat(i)+hat(j)+chat(k), (anebnec) are coplanar, then (1)/(1-a)+(1)/(1-b)+(1)/(1-c)=