1. The serial number can be achieved by adding th at the numbers that end with the exception of 1 (st), 2 (nd), and 3 (RD)
2. No. ty ends when a sequence to be changed to ty. Then add a tie th example,
twenty is the twentieth (at 20)
Thirty is the thirtieth (30th)
, No. 3 ends with a f ve ve changed first and then fill th instance,
then add th example,
five. Fifth is
the twelfth Twelve