Please help me with problem 1. Thank you.

1. Evaluate by expressing in terms of fuctoria's [37 2) 9 PE 5) 5 PO ( ) n (m-1) ( 3 ) ( 2 ) ( 1 ) 2. a) How many three- digit numbers can you form with the digits 1, 2, 3, 4, 5 ? [S] How many of these are odd? ( ) How many of them are even