Re: dse type test

Posted by sakshi on Jun 26, 2013; 2:42pm
URL: http://discussion-forum.276.s1.nabble.com/dse-type-test-tp7582977p7582985.html

A gambler has in his pocket a fair coin and a two-headed coin. He selects one
of the coins at random, and when he flips it, it shows heads.

Suppose that he flips the same coin a second time and again it shows heads.
9. Now what is the probability that it is a fair coin?
a) 0
b) 1/4
c) 1/5
d) None of the above
 

answer is coming to be 1/5??????


29. Your teacher knows 5 jokes and in each class tells 2 jokes; each joke has an equal chance of
being selected. What is the probability that, in a given lecture, at least 1 joke is told that was not
told in the previous class?
a) 9/10
b) 8/10
c) 7/10
d) 6/10