Question

17.27. How many Social Security numbers (see Exercise 8.12) have their nine digits in strictly increasing order

Answer 1

"10 possibilities" is the appropriate response.

Explanation:

The numbers will be:

⇒
`123 \ 456 \ 789`

Now anyway we commence with right and afterwards remove nine from eight and seeing as maintain the sequence growing.

then,

• 
  `012345678`
• 
  `012345679`
• 
  `012345689`
• 
  `012345789`
• 
  `012346789`
• 
  `012356789`
• 
  `012456789`
• 
  `013456789`
• 
  `023456789`

Thus, the above is the correct answer.