5 out of 6 persons who usually work in an office prefer coffee in the mid morning, the other always drink tea. This morning of the usual 6, only 3 are present. The probability that one of them drink tea is

Miss C has either Tea or Coffee at moming break. If she has tea one morning, the probability she bas tea the next moming is 0.4 . If she has coffee one morning, the probability she has coffee next moming is 0.3 . Suppose she has coffee on a Monday morning. The probability that she has tea on the following Wednesday morning is

A problem is given to three children, whose chances of solving it are 1/3 , 1/5 and 1/6 , what is the probability that : Only one of them solves it correctly

A survey shows that 73 % of the persons working in an office like coffee , whereas 65% like tea . If x denotes the percentage of them, who like both coffee and tea , then x cannot be :

In a class of 100 students 60 drinks tea. 50 drink coffee and 30 drink both .A students from this class is selected at random.Find the probability that the student takes (i) atleast one of the two drinks (ii) only one of the two drinks

In a office ,the ratio of the percentages of employees who like only tea, percentage of employees who like only coffee ,perscentage of employees who like neither of the drinks is 8 : 7: 6: 4 Find the percentage of employees who like neither of the deinks.

It is 9 to 5 against a person who is 50 years living till he is 70 and 8 to 6 against a person who is 60 years living till he is 80. Find the probability that at least one of them will be alive after 20 years.