A: ### Quick Answer

**There are 90,000 different number combinations that can be made in a five-digit number if numbers can repeat.** To determine the number of possibilities, each place digit has to be evaluated independently to see how many numbers could fit there and then all are multiplied together.

A five-digit number has five different place settings which can take on various values. The first digit can take on nine values, from 1 to 9. For the second through fifth digits any number between 0 and 9 can be used. To find the total number of combinations, these values are then multiplied together: 9 x 10 x 10 x 10 x 10 = 90,000 total combinations.

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- Q:
## How many possible combinations are there for a seven-digit number?

A:

Full Answer >**There are 720 different combinations for a seven-digit number.**This answer can be found using the (n[n-1][[n-2] ... to k factors)/k!, where n is the possible number of digits and k is the number of digits in the number. For a seven-digit number, the formula is 10!/7!.Filed Under: - Q:
## How many combinations can you make with six digits?

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Full Answer >**Using the digits 0 to 9, with no number repeating itself, 151,200 possible combinations of six digits.**However, if a true number is required, meaning 0 cannot be the first digit, only 136,080 combinations are available.Filed Under: - Q:
## How many combinations can be made with four numbers?

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Full Answer >**There are 10,000 combinations of four numbers when numbers are used multiple times in a combination.**There are 5,040 combinations of four numbers when numbers are used only once.Filed Under: - Q:
## What is an estimated digit?

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Full Answer >**The last digit in any number is referred to as the estimated digit.**In science, all other numbers are considered significant digits because they are precise measurements.Filed Under: