Chapter 6: Problem 8
Find the number of bytes that: Contain exactly nine \(0^{\prime} \mathrm{s}\) .
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Chapter 6: Problem 8
Find the number of bytes that: Contain exactly nine \(0^{\prime} \mathrm{s}\) .
These are the key concepts you need to understand to accurately answer the question.
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From the binomial expansion \((1+x)^{n}=\sum_{r=0}^{n}\left(\begin{array}{l}{n} \\\ {r}\end{array}\right) x^{r},\) it can be shown using calculus that \(n(1+x)^{n-1}=\sum_{r=1}^{n}\left(\begin{array}{c}{n} \\\ {r}\end{array}\right) r x^{n-1}\) . Using this result, prove each. $$ 1\left(\begin{array}{l}{n} \\\ {1}\end{array}\right)+2\left(\begin{array}{l}{n} \\\ {2}\end{array}\right)+3\left(\begin{array}{l}{n} \\\ {3}\end{array}\right)+\cdots+n\left(\begin{array}{l}{n} \\\ {n}\end{array}\right)=n 2^{n-1} $$
Two cards are drawn at random from a standard deck of cards. Find the probability that: One is a club and the other a diamond.
In \(1984,\) E. T. H. Wang of Wilfrid Laurier University, Waterloo, Ontario, Canada, established that $$\sum_{r=1}^{n} r^{3}\left(\begin{array}{l}n \\\r\end{array}\right) D_{n-r}=5 n !$$ Verify the formula for \(n=5\) and \(n=6\).
Evaluate each sum. \(1\left(\begin{array}{l}n \\ 1\end{array}\right)+2\left(\begin{array}{l}n \\\ 2\end{array}\right)+3\left(\begin{array}{l}n \\\ 3\end{array}\right)+\cdots+n\left(\begin{array}{l}n \\ n\end{array}\right)\) (Hint: Let \(S\) denote the sum. Use \(S\) and the sum in the reverse order to compute \(2 S .\))
Find the number of positive integers \(\leq 1000\) and \(n\) ot divisible by: 5 or 6
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