Five students and two teachers attend a conference at Statistics Canada. They pose for a picture. In how many ways can they line up, side by side, for a picture? In how many ways can they line up if they must have the teachers on both sides of the picture? What is the probability that the two teachers occupy two of the three middle slots?

480 ways

240 ways

Probability = 1/7

Step-by-step explanation:

Given:

Number of student = 5

Number of teacher = 2

Computation:

1. Number of ways can they line up, side by side, for a picture.

5! × 2! × 2

480 ways

2. Number of ways can they line up if they must have the teachers on both sides of the picture.

5! × 2!

240 ways

3. Probability that the two teachers occupy two of the three middle slots.

³C₂ × 5! × 2!

720 ways

Total number = 7! = 5,040 ways

Probability = 720 / 5,040

Probability = 1/7

this story was prepared by jim

mccullaugh in los angeles and

al stewart in new york.

new york the colossal success of "top gun" appears to have dramatically altered madison avenue's

perception of corporate sponsorship

of home video projects.

the paramount home video re- lease, featuring a 60- second diet

pepsi spot, was by no means the

first prerecorded video to carry an advertiser's plug, but it was the

first major theatrical release to do so. in the aftermath of the title's

success, paramount is widely ex- pected to ink a similar deal for

"crocodile dundee" or "star trek

iv" or both.

corporate america's new attraccds push british

recording sales

to 19% gain

london fueled by the compact

disk boom, the value of u.k. manu- facturer shipments of recordings

rose 19% in the 12 -month period ended march 1987, according to the

british phonographic industry.

total value of u.k. shipments for

the period was $755 million for all

configurations. (all value figures

are based on an exchange rate of

$1.68 to the pound sterling.)

cd sales totaled 10.7 million units

worth $121.3 million- compared

with 3.7 million units worth $39.5

million in the prior 12 months -and

accounted for two -thirds of the

overall gain in trade value. at present growth rates, says the bpi, cd

sales for calendar 1987 will reach 20

(continued on page 79)

step-by-step explanation:

b

step-by-step explanation: