In a class there are 60 boys and 20 girls. Half the boys and girls have merit scholarships. If a student is chosen at random the probability that the student be either a boy or a student with scholarship is

Required Probability=P(A∪B)       A=boy  B=student  with  scholorship      A∩B≠ϕ                                                                                          = 6080+4080−3080                                                     =7080=78