1352
1532
3152
3512
5132
5312
total = 6
More than one
"130" and "310" .
two
504
18
6*6*3 = 108 numbers.
More than one
Assuming the question refers to the digits 1, 2, ... , 9 the answer is 1344 numbers.
"130" and "310" .
98,764
two
18
504
998 - 3 digits even number Next even number is 1000 - 4 digits. So 998 is the largest ...
3 * 4 * 3 * 2 * 1 = 72;
24 of them. So we have a 2 or 6 in the unit position, therefore (2)(4)(3) = 24 even three-digit numbers, can be formed.
999,998