Find the value of n; if P(n, 4) = 42P (n. 2) (3). Simplify the following. (n+2)! (a). (b). 12C4 n! (4). Show that, (22) = 2(2) + n (5). If repetitions are not permitted, and from the digits 1,2,3,6,7,8. a). How many 3-digits numbers can be formed? b). How many 3-digits numbers of these numbers are less than 6000? c). How many 3-digits even numbers? d). How many 3-digits odd numbers? (5). Find the value of the extended Binomial coefficient. (a). (3) (b). (/)