a) The vehicle registration numbers in Dhaka city are formed as follow: first, these registration numbers contain the words “Dhaka Metro", followed by the vehicle class (represented by one of 31 Bangla letters), vehicle series (a 2-digit number from 11 to 99), and the vehicle number (represented by a 4-digit number). How man
y registration numbers can be created in this way? [3] b) Among a set of 5 black balls and 3 red balls, how many selections of 5 balls can be made such that at least 3 of them are black balls. [3] c) How many 4 digit numbers that are divisible by 10 can be formed from the numbers 3, 5, 7, 8, 9, 0 such that no number repeats?