simple solution, be quick as possible please

18- A coin is tossed three times. Find the probability that head and tail show alternately (one after the other). (2K) 19- A code consists of a two digit number chosen from 00 to 99, followed by two different letters of the alphabet. What is the probability the code is IZKY? (2T) 20- If I roll a twelve sided die, what is the probability that the result will either be an odd number or a perfect square? (2A) 21- A committee of three is to be formed from five math teachers and four English teachers. In how many ways can the committee be formed if order matters and there a) Are no restrictions? .(lK) 11} Must be one mathematics teacher? .(ZK) c) Must be at least one mathematics teacher? .(2K} 22- A class is surveyed to determine whether they prefer hockey or basketball. The table below shows the results. Given that a student is female, what is the probability that hockey is preferred? .(ZA) MIR asketbal] m-_ 23- In a large sample of families in Canada, it was found that 80% of husbands and 60% of the wives were employed outside the home. In 53% of the cases, both the husband and wife were employed outside the home. What is the probability that a- At least one spouse is employed outside the home. .(ZT) b- Neither spouse is employed outside the home. .(ZT) 24- The probabilities that John will receive an A, B, C, D, or E are 0.13, 0.26, 0.45, 0.11, and 0.05 respectively. 'What is the probability that John will get the following result? a An A or B .(ZK) b- At least a D .(2K) 25- A bag contains 3 nickels, 5 dimes, and 6 quarters. Ifa nickel is taken out and not replaced, state the probability that the next coin drawn will be a dime. .(2A) 26- Out of a group of 100 people, 63 are adults and 3'? are children. Of the adults, 31 have brown eyes and of the children, 29 have brown eyes. If a person is selected at random, determine the probability of that person being a child if the color of eyes is known to be brown. .(2A)