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How many 3-digit numbers have exactly 2 digits that are the same?
1
How many whole numbers from 1 to 100 contain the digit 3 exactly once?
18
How many numbers from 1 to 100 are there each of which is not exactly divisible by 4 but also has 4 as a digit?
12.
How many 2 digit numbers have exactly 1 digit 6?
18 8: 16...26...36...46...56...76...86...96
How many 2-digit numbers contain digit 1?
1
How many 1 digit numbers are there?
Count them
How many 5 digit combos in 30 numbers?
The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.
How many times does the digit 1 occur in ten place in the numbers from 1 to 1000?
How many times does the digit 1 occur in ten place in the numbers from 1 to 1000?
How many 3 digit numbers can be made with numbers 1 - 9?
999-111=888 888 3 digit numbers can be made with numbers between 1 - 9
How many 3 digit whole numbers are there between 1 and 1000?
There are 900 three-digit whole numbers between 1 and 1000
How many 5 digit combinations for numbers 1- 25?
There are 9 1-digit numbers and 16-2 digit numbers. So a 5 digit combination is obtained as:Five 1-digit numbers and no 2-digit numbers: 126 combinationsThree 1-digit numbers and one 2-digit number: 1344 combinationsOne 1-digit numbers and two 2-digit numbers: 1080 combinationsThat makes a total of 2550 combinations. This scheme does not differentiate between {13, 24, 5} and {1, 2, 3, 4, 5}. Adjusting for that would complicate the calculation considerably and reduce the number of combinations.
How many 4 digit pin numbers are there with numbers from 1 to 9?
10,000
