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emilianacassandra
09.01.2020 •
Mathematics
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?
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Ответ:
3024 numbers
336 numbers
Step-by-step explanation:
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.
First digit is selected in 9 ways
now we have only 8 papers
second digit is selected in 8 ways
third digit is selected in 7 ways
fourth digit is selected in 6 ways
4 digit numbers =
numbers
first digit is selected in only one way
second digit is selected in 8 ways
third digit is selected in 7 ways
fourth digit is selected in 6 ways
4 digit numbers =
numbers
Ответ:
200 blue marbles
Step-by-step explanation:
two-thirds of 600 is 400... so the rest is easy 600-400=200
brainliest pls