## How many unique 7-digit combinations are there?

Assuming repetition is allowed, you can have 7-digit numbers from 1,000,000 to 9,999,999 which is a total of 9,000,000 7-digit numbers. These are all the possible 7-digit numbers. In general, there are 9 × 10^(n-1) possible n-digit numbers.

How many 7-digit numbers can be formed using the digits?

=(420-60)=360.

How many combinations can be made with 7 numbers?

The number of combinations that are possible with 7 numbers is 127.

### How many unique numbers are there in 5 digits?

Thus you have made 5 × 4 × 3 × 2 1 = 120 choices and there are 120 possible 5 digit numbers made from 1, 2, 3, 4 and 5 if you don’t allow any digit to be repeated. Now consider the possibilities with 13 as the first two digits.

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How many 7 digit numbers are there with no digits repeated?

There are 9 digits you can have for the first digit (can’t have 0). There are then 9 more for the second (all except the first one). Similarly there are 8 for the third, 7 for the 4th, etc… So the total would be 9*9*8*7*6*5*4 = 544,320 7 digit numbers without repeated digits.

How many 7 digit numbers can be formed using 1/2 and/or 3?

We know that the factorial can be written by the formula n! =n×(n−1)! Therefore, the number of different seven-digit numbers that can be written using only three digits 1,2 and 3 is 672. Thus, option (A) is the correct answer.

#### How many seven digit numbers can be made from the digits 1 to 7 if repetition is allowed?

The numbers beginning with 0 won’t be 7 digit numbers, they would be 6 digit numbers. No. of such numbers are: 6!/(3!

How many 3 digit numbers can be formed using the digits 6 7 8 9 if digits can be repeated?

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Originally Answered: How many 3 digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 if repetitions of digits are allowed? That is, 900 three-digit positive whole numbers are there.

How many combinations of 7 alphanumeric characters are there?

Why Limit The Combinations To Only 7?

Characters Combinations
5 120
6 720
7 5,040
8 40,320

## How many combinations can be made with only 7 unique digits?

Lets first answer first option. So, you have number consisting from 7 unique digits. On first place you can put 10 difrent digits, on second place you can put only 9 digits, etc. So, number of combinations with no repeting digits is 10x9x8x7x6x5x4=604,800 numbers Second option is, that you can repeat digits.

How many possible 7-digit numbers are there?

Assuming repetition is allowed, you can have 7-digit numbers from 1,000,000 to 9,999,999 which is a total of 9,000,000 7-digit numbers. These are all the possible 7-digit numbers. In general, there are 9 × 10^ (n-1) possible n-digit numbers.

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How many ways can a 5 digit number be filled out?

Repetition of digits is allowed. ∴ Each place out of unit, 10th, 100th and 1000th can be filled in 5 ways. Total numbers =4× 5 × 5 × 5 × 5 =2500. How many possible combinations are there for a 5 digit number?

### What are the numbers that can’t be repeated?

If numbers can’t be repeated ant the first digit can’t be zero than the first 2 digits have 9 options, the first is anything but zero the second is zero plus the remaining 8 digits that aren’t zero that haven’t been used so 9 * 9 * 8 * 7 * 6 * 5 * 4, or 544320. Dwayne is in hot water for his latest comments.