Question

It´s about greeting.

When you arrive in a party alone and you want introduce yourself.

Answer 1

yes it's ok.but it's not formal

Answer 2

it is correct and it is neither formal nor informal. it is general english so you can use it anywhere, anytime.

Answer 3

Yes!

Answer 4

yes. that is totally fine

Answer 5

yes, we can

Answer 6

there is not any problem.