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Sealqaz

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Sealqaz

Can you solve this for me?

What number is missing from this series and why? 1,3,5,10,15,20,?,50,75,100,250. Let me know if you have any idea and why? Best of luck i've given in,got no hair left!
20:36 Mon 27th Nov 20062 answers, last by Geoff13 00:02 Wed 29th Nov 2006

Only 1 question