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Module 1: Arithmetic series

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Finding the sum of an arithmetic series

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XSIQ
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Core Mathematics - Finding the sum of an arithmetic series

Finding the sum of an arithmetic series

How can we find the sum of an arithmetic sequence? Work through the
example below.

The attraction of free icy poles for being in the school play results in
92 volunteers turning up for the first meeting. The realities of building
props, making costumes and learning lines causes 4 people to drop out each
week. By the time the play is performed only 32 remain. How many icy poles
has the school provided during the period?

Find the sum of the series. {92, 88, 84, 80 ....... 32}

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