A bag contains 7 red checkers and 11 black checkers. One checker is drawn and replaced. Then a second checker is drawn. What is the probability that a red checker was drawn both times?

Answer 1

there are 18 checkers in the bag each time and each time 7 of them are red
first time 7/18
second time 7/18
49/324 or about 0.15

Answer 2

Note:
This question is really the same as the four aces question you asked below.