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 Post subject: GL Paper 8 multiple choicePosted: Mon Jun 16, 2014 10:47 am

Joined: Thu Apr 04, 2013 8:19 am
Posts: 107
Hello
Question 16 in this paper is
there are 10 cans in this stack
the stack is 4 cans high

1
2 3
4 5 6
7 8 9 10

(Sorry these numbers supposed to show a diagram of the cans )

How many cans would there be in a stack like this that was 8 cans high?

I remember there si a formula for this question kind but I cannot remember it. Can anyone prod my memory?

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 Post subject: Re: GL Paper 8 multiple choicePosted: Mon Jun 16, 2014 11:44 am

Joined: Wed Apr 16, 2014 12:09 pm
Posts: 8
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31 32 33 34 35 36

= (n*(n+1))/2 = (8*(8+1))/2 = (8*9)/2 = 72/2 = 36

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 Post subject: Re: GL Paper 8 multiple choicePosted: Mon Jun 16, 2014 12:10 pm

Joined: Thu Apr 04, 2013 8:19 am
Posts: 107
Thank you so much As soon as I read it I thought of course!

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 Post subject: Re: GL Paper 8 multiple choicePosted: Mon Jun 16, 2014 12:17 pm

Joined: Sat Dec 28, 2013 3:52 pm
Posts: 845
If my memory is serving me right, will this be a sequence of triangular numbers?

Addition of 8 consecutive numbers -

1+2+3+4+5+6+7+8

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