The probability that any child in a certain class travels to school by bus is 2/5. if 4 children from the class are selected ata random, what is the probability 1. none of them travels to school by bus 2. three of then travel to school by bus 3. at least one of them travels to school by bus?

(c) the diagram shows the first three shapes of a matchsticks arrangement. first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.