How many 4 digit number can be made using 0 -7 with no repeated digits allowed?

My guess was since that is 8 digits, it would be 8x7x6x5, because one possibility is removed for each of the digits...but that gave me 1680 and its a multiple choice assignment question so thats not the answer :/

Question

How many 4 digit number can be made using 0 -7 with no repeated digits allowed?

My guess was since that is 8 digits, it would be 8x7x6x5, because one possibility is removed for each of the digits...but that gave me 1680 and its a multiple choice assignment question so thats not the answer :/

anonymous · Answer

first digit can not be 0

anonymous · Answer

in the first place we can use only 7 digits except 0
so for first place no of chances are =7
for secnd place there are ony 7 chances as one no is alredy used in first place
for third place 6 chances
for 5th place 5 chances
so result is 7 *7 *6 *5

anonymous · Answer

u were very close to answer ; just change 8 to 7 then u have 7*7*6*5

anonymous · Answer

ahhh......totally missed that. thank you very much!!