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mfb- t1_ix3zjbt wrote

Reply to comment by [deleted] in eli5 why is 9 the last number? and why then we use 10 and repeat in sets of 10? by anujshr7

It's just a convention that became dominant worldwide, most likely because we have 10 fingers. Systems with 12 and 60 were used in the past, too. You can still see this e.g. from 60 minutes in an hour.

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