If ω(≠1) is a cube root of unity and then A and B are respectively
a) 0, 1
b) 1, 1
c) 1, 0
d) – 1, 1
If (1 + x)n = C0 + C1x + C2x2 + . . . + Cnxn, then show that the sum of the products of the Cj’s is taken two at a time represented by is equal to