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As we are required to find out the last number, so this series should be even not odd. As you can see there are 8 digits in this series, so breaking it up into twos would end up you calculating last two digits. Here how it should go: break the series into sets of 3 like 181 470 70_ this way you end up calculating only the last digit. Now add up each set and you get? (1+8+1=10) (4+7+0=11)(7+0+?=12). So the answer is '5' which will make the last set add up to 12. and you will get a nice clean logical answer.

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Q: What is the solution for the series 18147070?
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