Question 1117861
He has a total of 18 coins. Of these, 5 are quarters. The probability of him choosing 3 quarters is:
Total coins: 18
Total quarters: 5
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
First draw: P(q) = 5/18
Second draw: P(q) = 4/17
Third draw: P(q) = 3/16
Multiply: 5/18*4/17*3/16 = 0.01225 = 1.225%