nice to meet you vs. nice meeting you

The use of these expressions is quite idiomatic.

'Nice meeting you' 

Say this when you meet someone for the first time, but say it at the end of the encounter. It's a bit like 'Goodbye'. You can also say thi

thank you for your answer!

then could you explain why (b) is the correct answer in the following question?
It was nice meeting you, Tom.
(a) It's nice of you to say so.
(b) Great to meet you, too.

don't you have to say "great meeting you?? "

Hi,

We were discussing the two specific expressions, using 'nice', that you asked about. I told you that their use is quite idiomatic.

There are also lots of other things you can say, and with many of them the first meeting/later meetings situation is less clear.

Answer B makes me think that Tom is perhaps saying good-bye after meeting the person for the first ti

I am not a native English speaker, but when people say "nice meeting you", it sounds like "I will probably not see you again, but take care." So when you hear "nice meeting you" in a job interview for example, that means you did not get the job.

Name withheld,
Tokyo, Japan

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Not true, Name withheld. 'Nice meeting you' is merely a complimentary farewell, and carries no implications beyond that.
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what should i reply for this.?

A: Nice meeting you.
B1: Nice meeting you, too.
B2: Good to meet you, too.
B3: Yes, indeed.

Can I say....."Good meeting you, too"?

Yes.

They are just the same. Nice meeting you is in GERUND form whereas nice to meet you is in infinitive form. Both of them have the same or comparable meaning. GERUND ( Base form of the verb ) while Infinitive ( to + base form of the verb ). I hope that answers your query.