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QUICK ANSWER
"Unos" is a form of "un", an indefinite article which is often translated as "a". "Unos cuantos" is a phrase which is often translated as "some". Learn more about the difference between "unos cuantos" and "unos" below.
unos cuantos
A phrase is a group of words commonly used together (e.g., once upon a time).
a. some
¿De quién son todos estos pantalones? - Unos cuantos son míos, y el resto, de mi hermano.Whose are all these pants? - Some are mine, and the rest are my brother's.
b. a few
Había muchos manifestantes, la mayoría pacíficos. Solo unos pocos provocaron incidentes.There were many demonstrators, most of them peaceful. Only a few stirred up some trouble.
un(
oon
)An indefinite article is a word that indicates that a noun is not specific (e.g., a girl).
1. (singular)
b. an (before vowel sound)
Tienen una vieja cámara que todavía funciona.They have an old camera which is still working.
