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Goryan [66]
3 years ago
10

A group of 10 people need to form a line. The line will consist of exactly 8 of the people. Person X and Person Y have to be eit

her fifth or sixth in line. How many different orders are possible?
Mathematics
1 answer:
skad [1K]3 years ago
6 0

Answer: N = 40,320

Step-by-step explanation:

To arrange 10 people to a line of 8 people.

The number of ways is n = 10P8.

But since the condition given states that 2 people must stay in two particular slots.

The number of possible arrangements becomes;

N = number of ways of arranging the remaining people × number of ways of arranging the other 2.

N = 8P6 × 2P2

N = 8!/2! × 2!

N = 20,160 × 2

N = 40,320 ways

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2 years ago
How do you go about doing this surface area problem?
hammer [34]
Break it down into 2-Dimensional shapes. Then add the areas together.

From the picture you can see;
front & back rectangles are 2*(4 x 8) = 64 m²
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