Question

Suppose there are 21 students in your class. If the teacher draws 2 names at random, what is the probability that you and your best friend will be chosen?

2/21
1/20
1/105
1/210

Please explain how you got your answer! Ty!

Answer 1

1/21 * 1/20 = 1/420  that is the probability that you are chosen first. 
Probability of your friend chosen first = 1/420 also.

So the required probability = 1/420 + 1/420  = 1/210 Answer

Its D