Question 21
Victor is struggling to recall his girlfriend’s phone number. He knows it is a 10-digit number. He only recalls the following:
- It starts with 07.
- The third digit is either 4 or 5.
- The next six digits consist of three 1s, two 2s and one 3, but he doesn’t remember the order.
- The last digit is a prime number.
At most how many tries does Victor have to make to guess the correct number?
- It starts with 07.
- The third digit is either 4 or 5.
- The next six digits consist of three 1s, two 2s and one 3, but he doesn’t remember the order.
- The last digit is a prime number.
At most how many tries does Victor have to make to guess the correct number?