Mathematics, 09.01.2020 01:31 dboby
9. there are nine slips of paper numbered from 1 to 9 in a bag. four slips are randomly selected without replacement to form a 4-digit number.
a. how many 4-digit numbers can be formed?
b. how many 4-digit numbers start with the digit 1?
Answers: 3
numbers  
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9. there are nine slips of paper numbered from 1 to 9 in a bag. four slips are randomly selected wit...
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