Chapter 12: Problem 59
Write the sum without using sigma notation. $$\sum_{k=3}^{100} x^{k}$$
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Chapter 12: Problem 59
Write the sum without using sigma notation. $$\sum_{k=3}^{100} x^{k}$$
These are the key concepts you need to understand to accurately answer the question.
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Price of a House The median price of a house in Orange County increases by about \(6 \%\) per year. In 2002 the median price was \(\$ 240,000 .\) Let \(P_{n}\) be the median price \(n\) years after 2002 (a) Find a formula for the sequence \(P_{n}\) (b) Find the expected median price in 2010 .
Interest Rate John buys a stereo system for \(\$ 640 .\) He agrees to pay \(\$ 32\) a month for 2 years. Assuming that interest is compounded monthly, what interest rate is he paying?
Determine whether the infinite geometric series is convergent or divergent. If it is convergent, find its sum. $$1-1+1-1+\cdots$$
If \(a_{1}, a_{2}\) \(a_{3}, \ldots\) is a geometric sequence with a common ratio \(r>0\) and \(a_{1}>0,\) show that the sequence $$\log a_{1}, \log a_{2}, \log a_{3}, \dots$$ is an arithmetic sequence, and find the common difference.
All Cats Are Black? What is wrong with the following "proof" by mathematical induction that all cats are black? Let \(P(n)\) denote the statement "In any group of \(n\) cats, if one cat is black, then they are all black." Step 1 The statement is clearly true for \(n=1\) Step 2 Suppose that \(P(k)\) is true. We show that \(P(k+1)\) is true. Suppose we have a group of \(k+1\) cats, one of whom is black; call this cat "Tadpole." Remove some other cat (call it "Sparky") from the group. We are left with \(k\) cats, one of whom (Tadpole) is black, so by the induction hypothesis, all \(k\) of these are black. Now put Sparky back in the group and take out Tadpole. We again have a group of \(k\) cats, all of whomexcept possibly Sparky-are black. Then by the induction hypothesis, Sparky must be black too. So all \(k+1\) cats in the original group are black. Thus by induction \(P(n)\) is true for all \(n .\) since everyone has seen at least one black cat, it follows that all cats are black. PICTURE CANT COPY
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