how many 5 digit numbers can be formed using all the digits 0,1,2,3,4 without repetition?
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that would be "0"
ignore the 0, thats how you do it right?
i meant 4!
well... this uses combination or permutation... i'm not sure... but answer my friend got was 96
but theres no repeats, so its a permutation
i got 120 now
well then could it be.... 1*4*4*3*2??
or would it be 1*2*3*4*5 because there are five digits
its not thenumbers that are important, but the digits and the fact they dont repeat
but isnt that saying that there is 5 ways to put the last number?
well then three is but the number cannot repeat!
the way i was taught was to draw out 5 lines, and figure out how many numbers can fill each space/ _ _ _ _ _
5 can fill the first space because we have 5 digits that cann be used. the next space would be 4 because we cannot reuse the letter we used in the first space and so on making it 5*4*3*2*1