How to solve

Ivh=VlvAvl where v is transpose of v, If w = (1, 1, 1) then lwlA equals (A) 0 (C)-1 (B) 1 (D) 2 27. Let M = {(a, a2, a3); aE{1,2,3,4),a +az2 +aa =6. Then the number of elements in M is (A) 8 (C) 10 (B) 9 (D) 12 28. The last digit of (38)2011 is (B) 2 (D) 8 (A) 6 (C) 4