3. A bag contains six red balls, four blue balls and two
yellow balls. If two balls are drawn at
random without replacement, the
probability that one ball will be red and the other will be
blue is:
(a)
0.364
(b) 0.333 (c) 0.182
(d) none of
these.
4. A bag contains six red balls, four blue balls, and two
yellow balls. If two balls are drawn at
random with replacement, the
probability either ball is red is:
(a) 0.227
(b) 0.250 (c)
0.750 (d)none of
these.
5. A and B are mutually exclusive events, and P ( A
) = 0 . 25 , P ( B ) = 1 3 . P ( A or B ) is:
(a)
0.583
(b) 0.5
(c) 0.083 (d) none
of these.
6. Three unbiased dice are rolled. What is the probability
that they all show different faces?
7. Two squares are chosen at random on a chessboard. What is
the probability that they have a
side in common?
8. Two squares are chosen at random on a chessboard. What is
the probability that they have a
side in common?
9. Find the probability of getting a total score of 15 points
in a throw of three identical dice.
10. A family was randomly chosen from a set of families having
four children. What is the
probability that there will be at
least one boy, assuming boys and girls are equally likely?