kimlyn58p0wyn0
05.05.2021 •
Mathematics
A car can travel 580 miles on a full tank of gas. With four new eco-tires it can travel 630 miles. Find the percentage increase the tires have made.
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Ответ:
Step-by-step explanation:
39.8, $51.00
Ответ:
2n*(2n-1)
Step-by-step explanation:
The fundamental rule of counting states that if we want to make an arrangement a1, a2, ..., an of n elements and a1 has k1 ways of being selected, a2 has k2 ways of being selected , …, an has kn ways of being selected, then there are
k1*k2*...*kn different possible arrangements.
In this case we have an arrangement of 2 elements ( 2 socks).
The first sock can be selected in n+n=2n ways. Since there are no replacement, the second sock can be selected in 2n-1 ways.
By the fundamental rule of counting there are 2n*(2n-1) ways of selecting the 2 socks.