View the step-by-step solution to:


If a six digit pass-code must have a 1 or 5 in the 1st place and a 1 or 5 in the last place but 1 & 5 are not

allowed in any other position, (example: 100235, 539781, 103471 etc.) how many possible pass-codes can be generated?

Top Answer

The 1st position can be filled in any two ways by 1 or 5, so no of possible ways to fill the 1st position is = 2 For each of... View the full answer

Sign up to view the full answer

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question