Here password is consist of 3 characters;
_ _ _
- First dash can be fill with 0 to 9 numbers: so total possibilities are 10.
- Second dash can be fill with 26 letters which are UPPERCASE : Total possibilities are 26
- Third dash can be fill with 26 small letters: total possibilities are 26
thus total no of distinct password are : 26*26*10 = 6760
but take an eg, a A 0 it can be arrange in 6 different ways
- a 0 A
- a A 0
- 0 a A
- 0 A a
- A a 0
- A 0 a
thus total possible arrangement can be 6760*6 = 40560 (distinct possible ways for a password).