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The original text is

they invented coins of different sizes

Is it OK if I say this instead?

they invented coins in different sizes

  • 1
    "invented coins"? Never heard such a thing. Maybe you mean "minted"? – user3169 Jul 11 '15 at 0:55
  • @user3169 Coins are not naturally occurring, somebody invented them – DCShannon Jul 13 '15 at 17:04
  • @DCShannon This really needs more context, but just changing coin sizes would not be considered an invention, unless there was a specific goal stated (why different sizes would be useful). Maybe if they were the first coins. For example, if you can buy 27" TVs, then if someone starts making 50" TVs, they would not be considered an invention. – user3169 Jul 13 '15 at 19:22
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Yes, it's okay. You'll be understood, and I doubt many would even pause upon hearing it.

That being said, I think "of different sizes" is the more natural and common way to put it, or perhaps "of different size".

See this related English SE question: Different size or different sizes?

Also look at this Google NGram for "of different sizes", "of different size", "in different sizes", and "in different size".

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