+0
as titled, thanks for your input.
Comments  
31st
So we should write 32nd, 103rd?

How about (n-1) -st? Thanks a lot.
Grammar Geek31st
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I think that you should always use -th in case of describing math formulas, e.g.: "(n-1)th member of the array"

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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!
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What do u mean by saying that?
Peacock FishYou are playing joke!