Challenge #2

Can you apply the techniques learned from the solution to Challenge #1 in order to find a value for these expressions?

1. \displaystyle 2 + \cfrac{1}{2 + \cfrac{1}{2 + \cfrac{1}{2 + \ddots}}}

2. \displaystyle 1 + \cfrac{1}{3 + \cfrac{1}{1 + \cfrac{1}{3 + \ddots}}}

3. \displaystyle \sqrt{1 + \sqrt{1 + \sqrt{1 + \sqrt{1 + \dots}}}}

About Brent

Associate Professor of Computer Science at Hendrix College. Functional programmer, mathematician, teacher, pianist, follower of Jesus.
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9 Responses to Challenge #2

  1. Elissa says:

    1) 2.5
    2) 1.847
    3) 1.618

    i think…

    and, just so you know…I did these while procrastinating from studying for my calc test tomorrow…

  2. Brent says:

    #3 is right, but #1 and #2 are not. guess you have some more procrastination ahead of you… (=

  3. Elissa says:

    hmmmm….well, procrastination is no longer needed…but fun is!

    1) 2.414 I am not sure WHAT I was thinking the first time…I did some very dumb things….oh, silly me!

    2) 1.333…

  4. Brent says:

    OK, you got #1 now. sorry to hear about the dumb things. (= #2 is still not right. How are you trying to solve it?

  5. Gordo says:

    Is #2 1.264?

  6. Brent says:

    yes, that’s right. Now, to a real mathematician, none of these answers would be technically correct since they are all approximations (the answer to #2 is not exactly 1.264, and so on). Does anyone know the exact answers (in terms of square roots and so on)?

  7. Gordo says:

    Ohh…this is fun. I guess it would be (3+√(21))/6?

  8. Brent says:

    you got it. Glad it is fun!

  9. sulgi says:

    brentos… hallo! i must confess i didnt try any of the math problems, but i just want to say hi to you and to mrs. joyia yorgey as well… hehe that still feels weird to say!

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