4 digits in between 0-9Can be gotten in in any type of order e.g 1234 4231 1324 will all workhas no repeating numbers

writing castle all the end i have 194 password to try.

You are watching: How many 4 digit number combinations are there

however the gaianation.net provides me 210 codes5040 various non repeating codes24 methods to write each code

5040/24 = 210

have ns overlooked something?

Thanks


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You’re 100% correct.

There space 10 possible numbers for the very first digit, and also then girlfriend can’t use that number again, for this reason 9 because that the second, and using the very same logic, 8 for the third and 7 because that the fourth. That way there’s $10 imes 9 imes 8 imes 7 = 5040$ combinations. Divide this by the variety of ways to order every one, 24, and you get 210, together you said.


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The gaianation.netematics you have actually done is sound, for this reason 210 is correct. The error have to be in creating them out, make sure you haven"t to let go any.


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