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Working out the combination of numbersThe number of three-digit integersAssumptions:
- You are using the numbers 0-9 (10 combinations each)
- You can use any number more than once
- You include leading zeros, ie. 001, 002
- '000' is a possible combination
There are exactly 1000 possible ways if all assumptions are true, and 900 if numbers under 100 do not count.
How to work it outMultiply the possible combinations so that it will be 10*10*10 or 103 (three times because there are three slots)
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How many 3 digit numbers are there show rough work?
The largest 3-digit number=999 the smallest 3-digit number=100 total number of 3 digit number=(999-100)+1 =899+1=900
How many periods does a 7-digit number have?
3
How many significant digit are in the number 30900?
3 in A+
How many 3 digit numbers can be found using 3 of the digits 6789 only once in each number?
4 options for the first digit, 3 options for the second digit, 2 options for the third digit. Multiply the number of options together, and you find how many 3-digit numbers you can get.
How many 3 digit number can you form from digit number using 4 5 7 without repeating any digit?
Six of them.
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