There are 1285C4 = 1285*1284*1283*1282/(4*3*2*1) = 113076300485 combinations.
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If repeats are allowed than an infinite number of combinations is possible.
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There are only five combinations: 1234, 1235, 1245, 1345 and 2345.
To calculate the number of possible combinations from 10 items, you can use the formula for combinations, which is nCr = n! / r!(n-r)!. In this case, n is the total number of items (10) and r is the number of items you are choosing in each combination (which can range from 1 to 10). So, if you are considering all possible combinations (r=1 to 10), the total number of combinations would be 2^10, which is 1024.
im assuming that any charcter can be a number or a letter: (24letters*10 possible numbers)^(4 digits)= 3317760000 possible combinations.