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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

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
**Posts:**0**Joined:**Mon Jan 28, 2013 8:06 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!!

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
**Posts:**268**Joined:**Mon Jan 28, 2013 8:03 pm

3 posts
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