doesn't and don't

[Unregistered]

A missed letter in a word and an extra word don't really count?

A missed letter in a word and an extra word doesn't really count" ?

I say the latter is correct. What is the rule behind this?

Thanks.

 

[Anglika]

The first one uses a plural verb, which goes with the two subjects: a missed letter and an extra word.

Why are the sentences given question marks?

 

[riverkid]

A missed letter in a word and an extra word don't really count?

A missed letter in a word and an extra word doesn't really count" ?

I say the latter is correct. What is the rule behind this?

Thanks.

Why do you think that the second one is the best choice, Unreg?