Question

What is the value of i^20+1?

a. 1
b. -1
c. -i
d. i

Answer 1

Answer: I

Explanation:

Answer 2

i

Explanation:

The powers of i repeat in cycle of 4. For example, here are the first 4:

1: i

2: -1

3: -i

4: 1

If a number is divisible by 4, i to the power of that number would be 1. So, i^20 is 1, but we are multiplying it by i again, so the answer would be 1 * i = i