2006-11-13 07:33:14 · 5 answers · asked by brie k 1 in Science & Mathematics ➔ Mathematics
000000 to 999999 --> 1 million combinations
10 choices for the first digit
10 choices for the second digit
10 choices for the third digit
10 choices for the fourth digit
10 choices for the fifth digit
10 choices for the sixth digit
10 x 10 x 10 x 10 x 10 x 10 = 1 million
However, if you disallow 0 as a starting digit then you have the following:
*9* choices for the first digit (1-9)
10 choices for the second digit (0-9)
10 choices for the third digit (0-9)
10 choices for the fourth digit (0-9)
10 choices for the fifth digit (0-9)
10 choices for the sixth digit (0-9)
9 x 10 x 10 x 10 x 10 x 10 = 900,000
2006-11-13 07:35:52 · answer #1 · answered by Puzzling 7 · 1⤊ 0⤋
000005 is just as valid a 6 digit number as 100005
so it would still be 10^6 or 1 million.
2006-11-13 08:04:38 · answer #2 · answered by Chris M 2 · 0⤊ 0⤋
there are 10^6 ways to arrange those digits but we don't want the ones that start with 0
one tenth of them (10^5) start with 0
so the answer is 10^6-10^5= 900,000
2006-11-13 07:37:06 · answer #3 · answered by Greg G 5 · 0⤊ 0⤋
10^6=1,000,000
2006-11-13 07:34:58 · answer #4 · answered by yupchagee 7 · 0⤊ 0⤋
1 - 999,999 and 0 , so one million numbers
2006-11-13 07:36:41 · answer #5 · answered by ignoramus 7 · 0⤊ 0⤋