Ina single toss of a fair die, what are the odds against the event that number 3 ar 4 turns up?

Choose the correct alternative for each of the following questions: What is the probability of the event that a number chosen from 1 to 50 is an odd number ?

Two coins are tossed simultaneously . Find the probability of the events at most one tail turns up.

There are 3 events A, B and C,only one of which must can happen. The odds against event A are 7:4 and against event B are 5:3 . Find the odds against event C.