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Discrete Math 10 Online
OpenStudy (anonymous):

How many 4- digit numbers contain at most 2 zeroes? (Caution: A 4- digit number does not start with zero)

OpenStudy (whpalmer4):

geez, the caution takes all the fun out of the problem :-)

OpenStudy (anonymous):

how many 4-digit numbers - that don't start with 0 - have 3 zeroes?

OpenStudy (anonymous):

8,991

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