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Julli [10]
3 years ago
14

In how many ways can people be lined up to get on a bus if a particular person always boards the bus first or last?

Mathematics
1 answer:
Ronch [10]3 years ago
6 0

Incomplete question. I Assumed the number of people is 6. In other words, In how many ways can 6 people be lined up to get on a bus if a particular person always boards the bus first or last?

Answer:

<u>6</u>

Step-by-step explanation:

Note, this question involves the use of the permutation formula; which helps <u>determine the arrangement or rearrangement of a set of objects in an ordered way.</u> Since we are told a particular person (ie 1 person) from among the group always boards first or last, it forms our r.

P(n,r)= \frac{n!}{(n-r)!} where n = number of people; r = the difference taken at a time.

P(n,r) = \frac{6!}{(6-1)!} = \frac{720}{120} = 6

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The sum of the first 3 terms of an arithmetic sequence is 21,while their product is 315.determine these 3 terms
Sphinxa [80]
Given: 
Sum of arithmetic sequence is 21.
Product of arithmetic sequence is 315.

I did a manual computation. Arithmetic sequence means that there is a constant difference between the two consecutive numbers.

x + (x+2) + (x + 2 + 2) = 21
3x + 6 = 21
3x = 21 - 6
3x = 15
x = 15/3
x = 5    1st number

x + 2 = 5 + 2 = 7 2nd number

x + 2 + 2 = 5 + 2 + 2 = 9  3rd number.

5 + 7 + 9 = 21
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3 years ago
1/7f- 5 1/2= 9/14. what is f?
Alex777 [14]
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O (-1, -2)

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