Question

which sentence is missing a comma?
thursday, october 13, 2022, was an emotional day for our family
i am leaving for seattle on monday january 1, 2023.
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Explanation:

In the sentence "I am leaving for Seattle on Monday January 1, 2023", when writing a date with a day of the week and a month - day - year format, a comma should be placed between the day of the week ("Monday") and the month ("January"). The first sentence has commas correctly placed around the date elements.

Answer:

I am leaving for Seattle on Monday January 1, 2023. (The sentence is missing a comma between "Monday" and "January", so this is the sentence with a missing comma.)