A few days ago
How many nine digit numbers can be formed by using the digits in the number 277,728,7887?
How many nine digit numbers can be formed by using the digits in the number 277,728,7887?
Top 3 Answers
A few days ago
Favorite Answer
I believe that Celines answer is factorial 10, written 10! (i.e. 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1). However this is the combinations of all numbers which can be made from the numbers given so includes one digit numbers, 2 digit numbers etc. and the question specifies 9 digit numbers
This would also include numbers which are technically different as they are in a different order but which look the same.
Therefore 277,782,7887 is different to 277,782,7887 because I have transposed (I promise!) the first two sevens but how do you know that? There are therefore many duplicates which we need to get rid of.
0 is a digit so there are only 10 digits of which only 3 are used so I think the answer is:-
9×3 = 27
Perhaps there’s a clue in the digits used in the question
0
A few days ago
Far too many for anyone to give an answer here.
.
0
A few days ago
3628800 ?
0
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