Probability With/ Without Replacement - Practice Topic Index | Grade 7 Math | Intermediate Test Prep | StudyZone

Sometimes a problem will not specifically state whether it is a problem "with or without replacement".  In these cases it is very important to ask yourself this question:
"Is this problem with replacement?"
or
"Is this problem without replacement?"
Let common sense and a little intuition guide you through these
types of problems.

 A bag of candy contains 4 lemon flavored sour balls, and 5 lime flavored sour balls.  If Tim reaches in, takes one out and eats it, and then 20 minutes later selects another and eats that one as well, what is the probability that they were both lemon flavored candies? Click Here  for the solution

 Mary has 4 dimes, 3 quarters and 7 nickels in her purse.  She reaches in and pulls out a coin, only to have it slip from her fingers and fall back into the purse.  She then picks out another coin.  What is the probability that she picked a nickel on both tries? Click Here  for the answer

 A man who goes to work long before sunrise every morning gets dressed in the dark.  In his sock drawer he has 6 black and 8 blue socks.  What is the probability that his first pick was a black sock, but his second pick was a blue sock? Click Here  for the answer

 Nancy has a half-dollar, a quarter, a dime and a nickel.  One day she picks a coin and puts it into her piggy bank.  Later on she chooses a second coin and also puts it into the bank.  What is the probability that the 2 coins totaled 35 cents? Click Here  for the answer

 A player selects 3 cards from a deck.  Find the probability that all three cards were picture cards. Click Here  for the answer

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