Using the digitis 1, 2, 3, 4, 8, 9, how many 3 digit numbers can be formed that are greater than 400? No repetition of digitis is allowed.
2007-01-18 07:27:37 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
3*5*4 = 60
There are 3 ways to select the first digit (either 4, 8, or 9). The second digit can be any of the remaining five digits. Then the last can be any of the four remaining after that. By the counting rule, you multiply these numbers to get 60.
2007-01-18 07:30:34 · answer #1 · answered by blahb31 6 · 2⤊ 1⤋
3 x 5 x 4 = 60
You can use either 4, 8, or 9 for the first digit.
You can use any of the remaining 5 digits as the second digit, since there is no repetition allowed.
You can use any of the remaining 4 digits as the third digit, since you can't reuse either of the first two.
Hope that helps!
:)
2007-01-18 15:32:59 · answer #2 · answered by MamaMia © 7 · 0⤊ 0⤋
3 * 5 * 4 = 60
In other words, you have three choices of digits for the first (hundreds) digit. Then you have five choices for the tens digit, and finally four choices for the ones digit. Multiply these together, and you get 60.
2007-01-18 15:31:00 · answer #3 · answered by Dave 6 · 1⤊ 0⤋
360
2007-01-18 15:33:41 · answer #4 · answered by omer b 1 · 0⤊ 0⤋
first, you should try making a chart to figure this one out yourself, but...since you asked...i'm pretty sure the answer is 60.
2007-01-18 15:38:25 · answer #5 · answered by James K 1 · 0⤊ 0⤋
60.
2007-01-18 15:34:52 · answer #6 · answered by JiveSly 4 · 0⤊ 0⤋
5288520, sure!
2007-01-18 15:34:52 · answer #7 · answered by Anonymous · 0⤊ 0⤋