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This is discrete functions. Can someone please help?? I can't figure out what I am doing wrong. I am supposed to get the indicated sum, but I keep doing something wrong. This is what series I have to work with x[15] for 0.3+0.003+0.00003+...... I know that a=0.3 and r=0.01 and n=15. so x[n] = a(r^n-1)/r-1 x[n] = 0.3((0.01)^15-1)/0.3-1 x[n] = 0.3((-1))/-7/10 but the outcome is 3/7. Is that the right outcome because the back of my text book says it's 10/33. And I don't understand what I am doing wrong. :/

Mathematics
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What is \(0.01^{15}\)?
that would be the common ratio or "r" to the exponent number of terms or "n"
Can you calculate this?

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Other answers:

Yes, when I calculate it I get 1.E-30, then I subtract 1 and get -1
There is a mistake in the denominator. x[n] = 0.3((0.01)^15-1)/0.3-1
oh
wow, I am so clueless
Actually, there are two mistakes.
Okay I see where I went wrong. Wow
Thank you so much :)

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