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 Post subject: PS Q82, p.110Posted: Tue Apr 05, 2011 4:29 am

Joined: Sun Jan 16, 2011 3:11 pm
Posts: 7
A string of holiday lights has a repeating color pattern of green, white, red, blue, orange, yellow. If the first light of the string is gree and the last last light is red, then the number of lights could be:

A. 23
B. 30
C. 37
D. 45 ----> is chosen as the answer
E. 55

Why is 45 the answer and how did they arrive at that? Anyone?

Thx

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 Post subject: Re: PS Q82, p.110Posted: Wed Apr 06, 2011 11:48 pm

Joined: Wed Apr 06, 2011 11:32 pm
Posts: 1
First calculate the sequence to get from green to red, which is 3, then calculate how many lights go through a full sequence to get back to red which equals 6. y=3+6x

Just plug in numbers from there and see what matches. 3+6*7=45

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 Post subject: Re: PS Q82, p.110Posted: Thu Apr 07, 2011 10:51 pm

Joined: Thu Apr 07, 2011 10:47 pm
Posts: 1
prep wrote:
A string of holiday lights has a repeating color pattern of green, white, red, blue, orange, yellow. If the first light of the string is gree and the last last light is red, then the number of lights could be:

A. 23
B. 30
C. 37
D. 45 ----> is chosen as the answer
E. 55

Why is 45 the answer and how did they arrive at that? Anyone?

Thx

6n+3 is the series...substitiuting the values the correct value is n = 7. which is there is answer

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