How many different 4-digit numbers are there if numbers can repeat?

So there are 4 x 3 x 2 x 1 = 24 possible ways of arranging 4 items. Therefore I divide 5040 / 24 = 210. So there are 210 different combinations of four digits chosen from 0-9 where the digits don’t repeat.

How many combinations of 1234 are there?

For example, 1234. Each combination of this type has 24 different box combinations, so your odds of winning by playing one “single” box combination would be approximately 1 in 417.

How many combinations does a 4 Number Lock have?

5,040 possible
We see that our formula gives that there are 5,040 possible 4-digit lock combinations.

How many combinations are there of 4 numbers without repeating?

15
The number of possible combinations with 4 numbers without repetition is 15.

How do you find a 4 digit combination?

For each choice of the first two digits you have 10 choices for the third digit. Thus you have 10x10x10 = 1000 choices for the first three digits. Finally you have 10 choices for the fourth digit and thus there are 10x10x10x10 = 10 000 possible 4 digit combinations from 0-9.

How many 4 digit combinations can 4 numbers make?

There are 10,000 combinations of four numbers when numbers are used multiple times in a combination. And there are 5,040 combinations of four numbers when numbers are used only once. How so? Well, there are 10 choices, zero through nine, for each number in the combination.

How many combinations are there to a 4-digit lock if you are unique?

If the four digits are unique (you did not clarify that point) there are 24 permutations (uniquely ordered combinations of a given 4 digits). If one (or more) of the digits is the same as one of the others, the number of permutations is lower.

How many possible combinations are there for a 2 digit number?

I need to find a specific 2 digit number using numbers 1-9 (one for each spot). Trying to figure out all the possible combinations I could make of numbers 1-9 for 2 spaces. I am pretty sure there’s a calculator of sorts online that does crap like this and list every single possible combination but can’t find it.

How to print all possible letter combinations of a phone number?

Given an integer array containing digits from [0, 9], the task is to print all possible letter combinations that the numbers could represent. A mapping of digit to letters (just like on the telephone buttons) is being followed. Note that 0 and 1 do not map to any letters.

How many different phone numbers are possible within an area code?

A phone number is composed of 10 digits. The first three are the area code the other 7 are the local telephone number which cannot begin with a 0. How many different telephone numbers are possible in a single area code? “Integers” is the wrong word here. It’s ten digits.