24 = 16
1111
1112, 1121, 1211, 2111
1122,1212,2112,2121,1221,2211
1222,2122,2212,2221
2222
5*5*4*4 = 400
There are 3 values (1, 2, 3) for each of the 4 digits. Therefore, there are 3*3*3*3 or 81 four digit numbers that can be formed.
1000 to 2999 inclusive so 2000 numbers.
25=20,21,23
90
7000 - 999 ie 6001 four digit numbers
900 numbers
There are 12 such numbers.
4! = 24 ■
9,000
3024
90
2240
There are 7200 such numbers.
how make the answer im don/now
3*3*2*1 = 18 of them.
625 if numbers can have leading 0s, 500 otherwise.