Answer:
thanks bro
Step-by-step explanation:
We can simplfiy to be 
.
We know that
is 10 and
is i, so the answer is 10i, or D.
Answer:
here
Step-by-step explanation:
https://www.rcboe.org/cms/lib/GA01903614/Centricity/Domain/1351/21.2%20permutations%20and%20probability.pdf