After mid term

I know it's two days after the mid term, but i still feeling bad being not familiar how to do the third question during the test. I didn't do much practice on well-ordering and structure induction, so when i saw the third question i was kind of panic.I hope i got the first two question completely right which can give me at least 10 out of 15. Structure induction is much hard than the other methods of proof i think.Maybe i need to spend more time on it before it's too late.

 BTW just finished csc207 A1, feeling good.But i have 2 quiz and 4 tests next week.It's suck when u have all the stuff coming at the same time.Good luck to myself.