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Mashutka [201]
3 years ago
7

appoint a planning committee with five different members. There are 14 qualified​ candidates, and officers can also serve on the

committee. What is the probability of randomly selecting the committee members and getting the five youngest of the qualified​ candidates?
Mathematics
1 answer:
kvasek [131]3 years ago
7 0

Answer:

Pr = \frac{1}{2002}

Step-by-step explanation:

See comment for complete question;

Given

n = 14

r = 5 -- committee members

k = 4 ---- officers (i.e. president, CEO, COO and CFO)

Required

Probability of selecting 5 youngest qualified members

First, we calculate the number of ways the committee can be appointed;

Any 5 members can be part of the committee; This means that we won't consider the order.

So, the number of ways is:

^{14}C_5

This gives:

^{14}C_5 = \frac{14!}{9!5!}

So, we have:

^{14}C_5 = \frac{14*13*12*11*10*9!}{9!*5*4*3*2*1}

^{14}C_5 = \frac{14*13*12*11*10}{5*4*3*2*1}

^{14}C_5 = \frac{240240}{120}

^{14}C_5 = 2002

There can only be a set of 5 young people. So, the probability is:

Pr = \frac{1}{2002}

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2 years ago
Yochanan walked from home to the bus stop at an average speed of 5 km / h. He immediately got on his school bus and traveled at
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Step-by-step explanation:

Yochanan walked from home to the bus stop at an average speed of 5 km / h. He immediately got on his school bus and traveled at an average speed of 60 km / h until he got to school. The total distance from his home to school is 35 km, and the entire trip took 1.5 hours. How many km did Yochanan cover by walking and how many did he cover by travelling on the bus?

walking - 5km/h                                         bus - 60km/h

distance walking - d₁                                 distance bus - d₂

time walking - t₁                                         time bus - t₂

d₁ + d₂ = 35

t₁ + t₂ = 1.5

v = d/t

vwalking = d₁/t₁

5 = d₁/t₁ ⇒ d₁ = 5t₁

vbus = d₂/t₂

60 = d₂/t₂ ⇒ d₂ = 60t₂

d₁ + d₂ = 35 ⇒ 5t₁ + 60t₂ = 35

_________________________

5t₁ + 60t₂ = 35

t₁ + t₂ = 1.5  (*-5)

5t₁ + 60t₂ = 35

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__________________________

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t₂ = 27.5/55 = 0.5 h

t₁ + t₂ = 1.5 ⇒ t₁ = 1.5 - 0.5 = 1h

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Answer:

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