Simple Problems on Single Events

The probability that two boys do not have the same birthday is 0.897. What is the probability that the two boys have the same birthday? 

A box contains some black balls and 30 white balls. If the probability of drawing a black ball is two-fifths of a white ball; find the number of black balls in the box.

A bag contains a red ball , a blue ball and a yellow ball , all the balls being of the  same size . Anjali takes out a ball from the bag without looking into it . what is the probability that she takes out .

(iii) blue ball?

There coins are tossed simultaneously . what is the probability of getting atleast two heads?

In a race between Mahesh and John, the probability that John will lose the race is 0.54. Find the probability of:

1. winning of Mahesh
2. winning of John

In a match between A and B; the probability of winning of A is 0.83. What is the probability of winning of B?

A card is drawn from a well shuffled deck of cards. What is the probability that the card drawn is neither a king nor a queen?

Two different dice are thrown at the same time. Find the probability of getting :

(ii)sum divisible by 5