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1.
If the probability that 
and 
will die with in a year are 
and 
respectively, then the probability that only one of them will be alive at the end of the year is
and will die with in a year are and respectively, then the probability that only one of them will be alive at the end of the year is
2.
In a binomial distribution the mean is 15 and variance is 10. Then parameter 
is
is
3.
Three squares of a chess board are chosen at random, the probability that two are of one colour and one of another
4.
If and are any two events, then probability that exactly one of them occurs is
and are any two events, then probability that exactly one of them occurs is
5.
The mean and variance of a binomial variable
are 2 and 1 respectively. The probability that 
takes values greater than 1, is
are 2 and 1 respectively. The probability that takes values greater than 1, is
6.
If a fair coin is tossed 20 times and let we get head times, then probability that is odd, is
times, then probability that is odd, is
7.
If a dice is thrown twice, the probability of occurrence of 4 at least once, is
8.
A box contains 9 tickets numbered 1 to 9 inclusive. If 3 tickets are drawn from the box without replacement. The probability that they are alternatively either {odd, even, odd} of {even, odd, even} is
9.
If the range of a random variable is {0,1,2,3,4,...}with 
for 
then 
is equal to
is {0,1,2,3,4,...}with for then is equal to
10.
If and are two events such that 
and 
then 
is equal to
and are two events such that and then is equal to