one digit: 5 ways two digits: 5 * 9 ways three digits: 5 * 9 * 8 ways four digits: 5 * 9 * 8 * 7 ways ... ten digits: 5 * 9! ways So if you have to use ten digits, then the answer is 5 * 9! = 1814400. If you can use anywhere from one to ten digits, then the answer is: 5 * (9! + 8! + 7! + 6! + 5! + 4! + 3! + 2! + 1) = 2045565
24. =4*3*2*1
none
10 digits
Ans is: 180 units place can filled in 2 ways tens place can filled in 10 ways hundreds place can filled in 9 ways =2*10*9=180
one digit: 5 ways two digits: 5 * 9 ways three digits: 5 * 9 * 8 ways four digits: 5 * 9 * 8 * 7 ways ... ten digits: 5 * 9! ways So if you have to use ten digits, then the answer is 5 * 9! = 1814400. If you can use anywhere from one to ten digits, then the answer is: 5 * (9! + 8! + 7! + 6! + 5! + 4! + 3! + 2! + 1) = 2045565
24. =4*3*2*1
i guess the answer is 54. A group of three digits can be selected from the 5 digits in 9 ways and each group can be arranged in 3! (i.e., 6) ways respectively and hence the answer is 6*9=54
5 x 4 x 3 x 2 = 120
none
10 digits
Ans is: 180 units place can filled in 2 ways tens place can filled in 10 ways hundreds place can filled in 9 ways =2*10*9=180
8+6+5--19
2 digits are in 30
There are 2 digits in 30. They are 3 and 0.
5 significant digits.
Depends on what they are, and how many total digits.