Question

The sum of all values of a, for which the points whose position vectors \(\hat{i}-2\hat{j}+3\hat{k},2\hat{i-3\hat{j}}+4\hat{k},(α+1)\hat{i}+2\hat{k}\) and \(9\hat{i}+(\alpha-8)\hat{j}+6\hat{k}\) are coplanar, is equal to

(1) 6

(2) 4 

(3) –2 

(4) 2

Answer 1

Correct option is (4) 2