Question

how many 5 digit numbers can be formed using all the digits 0,1,2,3,4 without repetition?

Answer 1

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Answer 2

24

Answer 3

0x1x2x3x4

Answer 4

that would be "0"

Answer 5

ignore the 0, thats how you do it right?

Answer 6

4!

Answer 7

i meant 4!

Answer 8

well... this uses combination or permutation... i'm not sure... but answer my friend got was 96

Answer 9

but theres no repeats, so its a permutation

Answer 10

i got 120 now

Answer 11

well then could it be.... 1*4*4*3*2??

Answer 12

or would it be 1*2*3*4*5 because there are five digits

Answer 13

its not thenumbers that are important, but the digits and the fact they dont repeat

Answer 14

but isnt that saying that there is 5 ways to put the last number?

Answer 15

well then three is but the number cannot repeat!

Answer 16

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