Q 12 . An experiment consists of tossing a pair of dice. Use the combinatorial theorems to determine the number of sample points in the sample space S. Find the probability that the sum of the numbers appearing on the dice is equal to 7. Q 13 . How many different seven-digit telephone numbers can be formed if the first digit cannot be zero? Q 14. A fleet of nine taxis is to be dispatched to three airports in such a way that three go to airport A, five go to airport B. and one goes to airport C. In how many distinct ways can this be accomplished