#### Aron Ronnie

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- Thread starter Aron Ronnie
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Is this what your class is studying?
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Arithmetic Sequences and Sums

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So the cost for the second metre is 15+ 2= £17, for the third metre is 17+ 2= £19, etc. Then you have you have the arithmetic series 15+ 17+19+ ... 59+ 61+ 63

One way to sum that is to write it as

15+ 17+19+ ...+ 59+ 61+ 63 and reverse it

63+ 61+ 59+...+ 19+ 17+ 15 and add VERTICALLY

15+ 63= 78, 17+ 61= 78, etc. Every sum is 78 and there are 24 such sums so the sum of both sequences is 24(78)= 1872. .........edited

Of course that is adding twice, so just one sum is 1872/2= £936,

A camera to be sent inside the hole . . .

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