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nnance4784
22.07.2019 •
Mathematics
Solve 5^x-2 = 200. round your answer to the nearest hundredth.
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Ответ:
Log5^(x-2)=log200
(x-2)log5=log200
(x-2)=log200/log5
x=log200/log5 +2
use your calculator: x=5.29
Ответ:
a) 2n(2n-1)
b) 2n(n-1)
c)![\displaystyle\frac{2n(n-1)}{2n(2n-1)}=\frac{n-1}{2n-1}](/tpl/images/0396/7247/99d4b.png)
Step-by-step explanation:
There are in total n + n = 2n socks.
(a) How many ways are there to select the two socks?
The first sock can be selected in 2n different ways. The second sock can be selected in 2n-1 ways.
Since the order in which the socks are selected does not matter, by the Fundamental Principle of Counting there are
2n(2n-1)
different ways of selecting two socks.
(b) How many ways of selecting the socks result in two socks of the same color being chosen?
There are n(n-1) different ways of selecting two white socks and n(n-1) ways of selecting two black socks, so there are
n(n-1) + n(n-1) = 2n(n-1)
ways of selecting two socks of the same color.
(c)What is the probability that a randomly chosen pair of socks are the same color?
If every way of selecting the two socks is equally likely, the probability is