31th or 31st?

31st

So we should write 32nd, 103rd?

How about (n-1) -st? Thanks a lot.

Grammar Geek31st

I think that you should always use -th in case of describing math formulas, e.g.: "(n-1)th member of the array"

Well, I saw a lot of cases in math books using (n-1)-st. May I have another input about this from a native English speaker? Thanks a lot.

SimpleHeartedI think that you should always use -th in case of describing math formulas, e.g.: "(n-1)th member of the array"

You are playing joke!

What do u mean by saying that?

Peacock FishYou are playing joke!

Oseeas titled, thanks for your input.

31th or 31st?

Oseeas titled, thanks for your input.

31st

31

31 st