Statistics/Discrete Math Recurrence Questions - which of the following are true for integers…

[MaryStew]

Can someone explain why the answer for 12 is d) and why the answer for 13 is b)? I'm trying to study for a test tomorrow but I'm looking over the answers for this practice test and I genuinely don't understand why these are the correct answers/how to even attempt these types of questions to begin with.

I would really appreciate some guidance.

 

[Steven G]

You might have gotten a reply by now if you followed the guidelines for this forum which clearly states that to receive work you need to post a clearly stated problem and show your attempt at solving it. So what have you tried? Where are you stuck? It is very hard to offer help if you do not show us any work at all.

For the 1st problem, what is A1?, A2?, A3?.... Do you see a pattern. Even if you don't which choice match the rule for the 1st few Ai??