https://padlet.com/chungchunkit1997/y6xkteyjtuiv Ask questions!~ en-us 2019-04-24 10:55:00 UTC 2021-07-11 15:50:16 UTC hello@padlet.com chungchunkit1997 https://padlet.com/chungchunkit1997/y6xkteyjtuiv/wish/353678835 You can ask any question during our class!]]> 2019-04-24 10:56:00 UTC https://padlet.com/chungchunkit1997/y6xkteyjtuiv/wish/353678835 https://padlet.com/chungchunkit1997/y6xkteyjtuiv/wish/353679397 Why we use ncr instead of npr for question 3?]]> 2019-04-24 10:59:37 UTC https://padlet.com/chungchunkit1997/y6xkteyjtuiv/wish/353679397