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Mikey5818
21.04.2020 •
Mathematics
Shown in the figure is a plan for the top of a wing of a jet fighter. (Round your answers to one decimal place.)
If the fuselage, f, is 4.30 feet wide, approximate the wing span CC'.
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Ответ:
For each of those . . .
The second member can be any one of the remaining 14 people.
For each of those . . .
The third member can be any one of the remaining 13 people.
For each of those . . .
The fourth member can be any one of the remaining 12 people.
The number of ways to make a 4-member group is . . .
(15 x 14 x 13 x 12) = 32,760 ways.
BUT . . . there aren't that many DIFFERENT GROUPS.
Each 4-member group can be arranged in (4 x 3 x 2 x 1) = 24 different orders.
All those possible orders show up in the 32,760 number.
Each different group gets counted 24 times in that number, in all its possible orders.
The number of DIFFERENT 4-member GROUPS that can be formed
from the 15 people is
(32,760) / (24) = 1,365 different groups.