Posted by Anon on Wednesday, July 17, 2013 at 9:42pm.
A pizza parlor has 13 different toppings available for its pizzas, and 2 of these toppings are pepperoni and anchovies. If a customer picks 2 toppings at random, find the probability that pepperoni is one of the toppings.
Round to four decimal places.

Stats  PsyDAG, Thursday, July 18, 2013 at 1:03pm
Probability of picking pepperoni on the first pick = 1/13.
Assuming that customer does not want to "double up" on any topping, 12/13 for first pick for some other topping and 1/12 for second for pepperoni. If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.
Eitheror probabilities are found by adding the individual probabilities to combine with first sentence results.

Stats  Anonymous, Monday, March 23, 2015 at 2:28am
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