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 Post subject: Need help on Probability-type QuestionPosted: Sat Mar 28, 2009 6:41 am

Joined: Tue Jul 31, 2007 9:37 am
Posts: 424
Hi there

In a game played by two teams, there are lots of ways of scoring points.

Ways of scoring, Points
Alpha, 1 point
Beta, 2 points
Gamma, 4 points

How may different ways can a score of 5 be made?

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 Post subject: Posted: Sat Mar 28, 2009 8:58 am

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 13010
Quote:
Alpha, 1 point
Beta, 2 points
Gamma, 4 points

You have to be logical to find them all!!

Try one score only first:

1+1+1+1+1 = 5 (now add in the ways with a 2)

1+1+1+2 = 5 (does order matter in the question because you can do these in 'different' ways)
1+ 1+ 2+ 1= 5
1+ 2+ 1+ 1= 5
2+ 1+ 1+ 1 = 5 [ note how I've 'moved' the 2 along to make sure I get all the ways]

1+ 2 + 2 = 5
2+1+ 2 = 5
2+2+ 1 = 5

1+ 4 =5
4+ 1 = 5

So I would, as a mathematician, say 10 but you could also argue that 4 is the answer!

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 Post subject: Posted: Mon Mar 30, 2009 11:22 am

Joined: Wed Jan 09, 2008 1:13 pm
Posts: 38
Location: Watford
I got 4 ways, same as Guest55

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 Post subject: Posted: Mon Mar 30, 2009 7:39 pm

Joined: Mon Mar 02, 2009 9:31 pm
Posts: 118
Well I thought the answer was 2. I thought the two teams part of the question was relevant, and that it was the combined score of both teams that had to make 5, therefore the options were:

4 + 1 = 5
1 + 4 = 5

Answer 2 different ways.

(I accept I am probably wrong, but the question isn't very clear, is it?)

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 Post subject: Posted: Mon Mar 30, 2009 8:20 pm

Joined: Tue Jul 31, 2007 9:37 am
Posts: 424
Thanks everyone. I got the answer of 4 aswell, however, I was not convinced - untill the responses came back.

Thanks again.

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 Post subject: Posted: Mon Mar 30, 2009 8:34 pm

Joined: Mon Mar 02, 2009 9:31 pm
Posts: 118
I'm so glad both of my children are much, much more intelligent than me

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