Why in the name "Two sum problem" there is "sum" and not "sums"?
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For the same reason you go on a two mile hike and pay for your tea with a two pound coin. – RegDwigнt Nov 28 '19 at 13:35
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I'm sorry, I'm not a native speaker and that's the first time I came across such a rule. Could you find some description of it, or simply its name? – Karol Selak Nov 28 '19 at 14:27
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Like a million dollar question; not million dollars question – Ram Pillai Nov 28 '19 at 14:37
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1The rule is: Nouns in a noun compound are singular. Even though everybody buys shoes two at a time, they go to a shoe store to do it, not a *shoes store, which is ungrammatical (marked by a star). You can get more detail at the duplicate question marked above. – John Lawler Nov 28 '19 at 14:57
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... The rule has exceptions (as most seem to). A nine days wonder. – Edwin Ashworth Nov 28 '19 at 15:48