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Math Help - 3 Discrete Math Problems

  1. #1
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    Mar 2008
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    3 Discrete Math Problems

    Here's a few discrete math problems. I just threw them up in photoshop so it looks clean. For those of you who help me out with these, please do your best to explain thoroughly. I'm going to be tested on similar problems on Monday, so i really need to understand the process.

    These are the only 3 out of 20 i need help on, so I guess i'm doing alright

    http://img256.imageshack.us/img256/1539/math1hz1.jpg


    thanks guys
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  2. #2
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    Mar 2008
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    well it looks like i didn't give the right first problem. The (-1) on the right is supposed to be (-1)^n.

    anyways, i've gotten number 1 somewhat done. I set n = 0, and that checked out, then I got n = k, and then did the k+1. What I'm left with now is the following.

    ... = ((2^(k+1))/(3*2^k)) + (((-1)^k)/(3*2^k)) + (-1/2)^(k+1)

    I'm really not sure what to do after this point...

    thanks
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