12 (a) Diberi bahawa set A dan set B adalah dua set data dengan keadaan (1) = 5 dan n(B) = 10. Min bagi set 4 dan set B masing-masing ialah 3 dan 6. Given that set A and set B are two sets of data such that n(A) = 5 and n(B) = 10. The mean of set A and set B are 3 and 6 respectively.

(i) Jika 4 0 B = 0, cari min bagi data AUB. IfAB=0, find the mean of the data of AUB.

(ii) Seterusnya, cari varians bagi data 1 UB sekiranya hasil tambah kuasa dua bagi semua unsur-unsur dalam set A dan set B masing-masing ialah 300 dan 200. Hence, find the variance of the data of AUB if the sum of square for all the elements in set A and set B are 300 and 200 respectively.

(b) Senarai semua subset bagi set A = {a,b,c}. List all the subsets of set A = (a, b, c). ​