[" 24.The probabilities that a student will receive "A,B,C" and "D" grades are "0.4,],[0.35,0.15" and "0.1" respectively.Find the probability that a student will "],[" receive "],[[" (i) a grade other than "A," (ii) "aB" or a "C" grade "],[" (iii) at least a "B" grade "," (iv) at most a "C" grade."]]