if the vectors ai+j+k,i+bj+k,i+j+ck (a not egual to 1,b is not equal to 1,c is not equal to 1)are coplanar, then the value of 1/1-a+1/1-b+1/1-c is equal to
if the vectors ai+j+k,i+bj+k,i+j+ck (a not egual to 1,b is not equal to 1,c is not equal to 1)are coplanar, then the value of 1/1-a+1/1-b+1/1-c is equal to