Page 1 of 1
A four or five-digit PIN is to be selected from the eight digits 0,1,2,3,4,5,6,7. 1. How many 4-digit PINs are possible
Posted: Mon Jul 11, 2022 11:44 am
by answerhappygod
- A Four Or Five Digit Pin Is To Be Selected From The Eight Digits 0 1 2 3 4 5 6 7 1 How Many 4 Digit Pins Are Possible 1 (34.27 KiB) Viewed 47 times
A four or five-digit PIN is to be selected from the eight digits 0,1,2,3,4,5,6,7. 1. How many 4-digit PINs are possible if: a) all 4 digits are the same? e.g. 1-1-1-1 b) no digit can be repeated? c) any digit can be repeated? d) the first 2 digits must be different digits and the last 2 digits must be the same, but none of the first 2 digits can be used in the last 2? 2. Suppose any digit can be repeated, how many 4-digit PINS are possible if each PIN: a) must end with "4"? b) must not start with "2"? c) must neither start with "0" nor end with "0"? 3. Suppose no digit can be repeated, how many 5-digit PINs are possible if each PIN: a) must end with "4"? b) must not start with "2"? c) must neither start with "0" nor end with "0"?