Incorrect spelling, explanation:
72th is an incorrect form, because ending th is added to ordinal numbers, which full-word form ends with such sound, for example 55th (fifty-fifth). With number seventy-second (72nd) we should use ending nd as in second. Therefore 72nd is the correct form.
Correct spelling, explanation: this form is correct as ordinal number second ends with nd, and so is every ordinal number, which ends with 2nd. Therefore the correct form is 72nd, not
72th. Ending th is used with most ordinal numbers, but 1st, 2nd and 3rd. Due to this, 72nd is the correct form.
Definition of 72nd:
numeral, ordinal number between 71st and 73rd
-Do you know how old is Mrs Simons? -She had her 72nd birthday last month.
Mr Jenkins is a very experienced lawyer. This was his 72nd case.
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