Question

If A = [(i, 0, 0), (0, i, 0), (0, 0, i)], i = √-1, then An = I where I is unit matrix when n = ...

(a) 4p + 1

(b) 4p + 3

(c) 4p

(d) 4p + 2

Answer 1

The correct option (c) 4p

Explanation:

A = iI

An = inIn = inI = I if n = 4p