"Mucho gracias." vs. "Muchas gracias."
The noun gracias is plural and feminine, so any adjective used with it must also be plural and feminine.
- Mucho is singular and masculine. Oops, that won't work.
- Muchos is plural and masculine. Nope, still not right.
- Mucha is singular and feminine. Getting warmer.
- Muchas is plural and feminine. Hooray! It matches with gracias in number and gender.
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