When to use dois and duas with plural nouns

Is there a set rule for which nouns to use with dois and which ones to use with duas?

e.g.: Uma mão, duas mãos; Uma lição ou duas lições?

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Yes, @kareemdjerdjouri :slight_smile: Um/uma and dois/duas are used according to the grammatical gender of the noun, which should be the same in the singular and plural. Um and dois are for masculine nouns; uma and duas for feminine ones.

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