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There are 5 pennies, 7 nickels, and 9 dimes in an antique coin collection
two coins are to be selected at random from the collection. Find each
10. P(selecting 2 pennies), if no replacement occurs
11. P(selecting 2 pennies), if replacement occurs
12. P(selecting the same coin twice), if no replacement occurs

 Apr 15, 2020
 #1
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There is a total of 5 + 7 + 9 = 21 coins.

The probability of selecting 2 pennies (no replacement)  =  5/21 x 4/20

The probability of selecting 2 pennies (with replacement)  =  5/21 x 5/21

The probability of selecting the same coin twice (without replacement)  =  0  (once he coin has been selected, it can't be selected again, if there is no replacement)

 Apr 16, 2020

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