How many 4 digit possibilities can you make using 2, 5, 8, 0? - 1
I got locked out of my Iphone, and the numbers never repeat.
24 possibilities
No.of possible outcomes - 4*3*2*1 = 24 (without repeating)
no.of possible outcomes - 4*4*4*4 = 256 (repeating)
24 ways
Do those numbers relate to any date or anything?
OK, so you make a truth table. The first digit has 4 possibilities, the 2nd digit has 3 possibilities, the 3rd digit has 2 possibilities, leaving 1 for the last digit, which makes for 4*3*2*1=24 possibilities. In essence, you are "counting" in base 4. If you allow repeated digits as in 2220 or 5508, then you have 4*4*4*4=256 possibilities.
4! (Factorial)
4*3*2*1 = 24 (total number of possible combinations with no repeats and order is not important)
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