100 students appeared for two examinations. 60 passed the first, 50 passed the second and 30 passed in both. Find the probabilty that a student selected at random: passed in at least one examination.

In a competitive exam 50 students passed in English. 60 students passed in Mathematics. 40 students passed in both the subjects. None of them fail in both the subjects. Find the number of students who passed at least in one of the subjects?

In a group of students, 50 students passed in english, 60 students passed in mathematics and 40 students passed in both the subjects. Find the number of students who passed either in english or in Mathematics.

Out of 80 students in a class , 30 passed in Mathematics, 20 in Electronics and10 in both. If one students is selected at random. The probability that the student has passed in none of the subject is

Out of 200 students from a school. 135 like kabaddi and the remaining students do not like the game. If one student is selected at random from all the students, find the probability that the student selected doesn't like kabaddi.

A student has appeared for an examination.There are 20 questions in the paper,with four multiple answers.If he answers correctly,he gets 4 marks and if the answer is wrong,then he gets-1 mark.A student will pass in the examination if he gets 50% of the marks.If a student answer by sheer guessing,then what is the probability that he will pass in the examination?

Examine the figure Can these be passed on to the progeny? How?