# Advent calendar 2017

## 8 December

The odd numbers are written in a pyramid.

1 | ||||

3 | 5 | |||

7 | 9 | 11 | ||

etc. |

What is the mean of the numbers in the 23rd row?

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The odd numbers are written in a pyramid.

1 | ||||

3 | 5 | |||

7 | 9 | 11 | ||

etc. |

What is the mean of the numbers in the 23rd row?

Not Roman numerals

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