Saw this question on the internet and thought its rather interesting. A-levels students should be all buried other their workload, amidst the mock papers and ten year series. Hopefully this might help.

$\frac{100001 + 100003 + 100005 + \ldots + 199999}{1 + 3 + 5 + 7 + 9 + 11 + 99999} = ?$

Hint: try and group the number together.

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