Find the probability of guessing the top three winners​ (in any​ order) from a group of 22 finalists in a spelling bee.

The probability is 1/9240.

There is a 1/22 chance of guessing the first one; after that, 1/21 for the second; and 1/20 the third:

(1/22)(1/21)(1/20) = 1/9240.