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Ninety coins are to be distributed among P,Q and R such that P gets twice as many coins as Q gets and Q gets thrice as many coins as R gets. Find the number of coins R gets.

Suppose you spin the wheel List the number of outcomes of getting a green sector and not getting a green sector on this wheel (i) Find the probability of getting a green sector (ii) Find the probability of not getting a green sector.

Probability that a man will get tea is 2/3 , and that he will not get coffee is 5/9 . If the probability of getting at least one during is 4/5, then probability that he will get both is

Two coins are tossed once. Find the probability of (i) getting 2 heads (ii) getting at least 1 head (iii) getting no head (iv) getting 1 head and 1 tail

Three coins are tossed simultaneously: P is the event of getting at least two heads.Q is the event of getting no head.R is the event of getting head on second coin

An unbiased coin is tossed is tossed a fixed number of times. If the probability of getting 4 heads equals the probability of getting 7 heads, then the probability of getting 2 heads , is