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Method 1: four digit number start after 999 and end at 9999
so 4 digit no. = 9999-999 = 9000
method 2: - - - - there are four places in 4 digit no. In first place only 1-9 can come , for rest 0-10
so total no. = 9*10*10*10=9000
* * * * *
Wrong!
Those are the number of PERMUTATIONS, not combinations. In a combination, the order of digits does not matter. So 1234 is the same as 1342 or 4213 etc.
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What are all 4 digit combinations for 9012?
There are more than 4.
How many 4 digit combinations can be made using numbers 1 2 3 4 6?
120 combinations using each digit once per combination. There are 625 combinations if you can repeat the digits.
How many possible combinations of a 7-digit number?
If the same 7 digits are used for all the combinations then n! = 7! = 7*6*5*4*3*2*1 = 5040 combinations There are 9,999,999-1,000,000+1=9,000,000 7-digit numbers.
How many 4 digit codes can you get from the numbers 1 2 3 4 and 5?
For the first digit you have 5 options, whichever you choose for the first digit, you have 4 options for the second digit, etc.; so the number of combinations is 5 x 4 x 3 x 2.For the first digit you have 5 options, whichever you choose for the first digit, you have 4 options for the second digit, etc.; so the number of combinations is 5 x 4 x 3 x 2.For the first digit you have 5 options, whichever you choose for the first digit, you have 4 options for the second digit, etc.; so the number of combinations is 5 x 4 x 3 x 2.For the first digit you have 5 options, whichever you choose for the first digit, you have 4 options for the second digit, etc.; so the number of combinations is 5 x 4 x 3 x 2.
What are the possible combinations for a 4 digit code?
Too many to list here-see below.
