Sequences IB Maths HL

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Sequences IB Maths HL

Postby Max » Mon Apr 01, 2013 8:04 pm

IB Mathematics HL – Arithmetic Sequence


An artist is creating a triangular shaped sculpture made of marbles.
There are 60 of the marbles in the first row with three less in each row. How
many marbles are in the 16th row?

Thanks
Max
 
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Re: Sequences IB Math HL

Postby miranda » Mon Apr 01, 2013 8:07 pm

IB Mathematics HL – Arithmetic Sequences (Progressions)


This situation is represented by an arithmetic sequence. Since the number of
marbles decreases by 3, the common difference is -3 and d = -3.
The first term is 60, common difference is d = -3, and n =16.
To find the nth term, you will use the following formula for a
arithmetic sequence:


where
So



Hope these help!! :) :)
miranda
 
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Re: Sequences IB Maths HL

Postby Max » Mon Apr 01, 2013 8:10 pm

Thanks miranda!!
Max
 
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