The probability that a student will receive A, B, C or D grade or 0.40, 0.3, 0.1 and 0.10 respectively. Find the probability that a student will receive.
i. B or C grade   ii. at most C grade.

X is taking up subjects Mathematics, Physics and Chemistry in the examination. His probabilities of getting grade A in these subjects are 0.2, 0.3, and 0.5 respectively. Find the probability; that he gets (i) Grade A in all subjects (ii) Grade A in no subject (iii) Grade A in two subjects

The probability that Sunil will recelve a D in is matchematics course is 0.61 and the probability that he will receive a C is 0.28. What is the probability tat Sunil will receive a C or D in mathematics ?

The probability that a student entering university will graduate is 0.4. Find the probability that out of 3 students of the university: (i) none will graduate, (ii) only one will graduate, (iii) all will graduate.

The probability that a student will pass his examination is 0.73, the probability of the student getting a compartment is 0.13 and the probability that the student will either pass or get compartment is 0.96.

The probability that a student will pass his examination is 0.73, the probability of the student getting a compartment is 0.13. The probability that student will either pass or get compartment is

Three persons A,B and C fire a target in turn . Their probabilities of hitting the target are 0.4 , 0.3 and 0.2 respectively . The probability of two hits is

The probabilities of a student getting I, II and III division in an examination are 1/(10),3/5a n d1/4\ respectively. The probability that the student fails in the examination is (197)/(200) b. (27)/(100) c. (83)/(100) d. none of these

The probability of two events A and B are 0.25 and 0.50 respectively. The probability of their simultaneous occurrences 0.15. Find the probability that neither A nor B occurs.

The gold number of protective colloids A,B,C and D are 0.02, 0.002, 10 and 30 respectively. then the protective powers of A,B,C and D are in the order

The gold numbers of protective colloids A,B,C and D are 0.04, 0.004, 10 and 40 respectively . The protective powers of A,B,C and D are in the orders .