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Probability
1) A
bag contains red, black and white socks. What is the least number of socks
that must randomly be taken out of the bag to be sure of having five pair
of socks? (A pair is two socks of the same colour)
(A) 10
(B)
12
(C) 15
(D) 18
(E) 20
2) What is the probability of thro wing two dice in one toss so
that they total 11?
(A) 1/6
(B) 1/11 (C) 1/18
(D) 1/20
(E) 1/36
3) How many
combinations are possible if a person has 4 sports jackets, 5 shirts, and
3 pairs of slacks?
(A) 4
(B) 5
(C) 12
(D) 60 (E) 120
4) If the 2 students
are chosen at ran don from a class with 5 girls and 5 boys, what; s the
probability that both students chosen will be girls?
(A) 1/2 (B) 1/5
(C) 1/9
(D) 1/10
(E) 2/9
5)
A bag contains 22 balls. If there are 10 red, 7 white, and 5
purple balls. What is the minimum number of ball one must pick up from the
bag to be assured of two balls of any one colour ?
(A) 3
(B) 4
(C) 6
(D) 18
(E) 22
6) What is the difference of the largest and the smallest number
written by the digits 3,7,0,4 using once only.
(A) 4383 (B) 7083
(C) 9083 (D) 6083
(E) None of these
7)
Mr. chithoo
invited 4 friends to go with him to the movies. There are 120 different
ways in which they cam sit together in a row. In how many, of those ways
Mr. Chithoo is sitting in the middle.
(A) 20
(B) 21
(C) 24
(D) 70
(E) 60
8)
In how many ways
can a group of 3 or mere persons be selected from 6 persons?
(A) 26
(B) 42
(C) 63
(D) 41
(E) None of these
9)
A committee of 5
students is to be chosen from 6 boys & 4 girls. Find the probability
that the committee contains exactly 2 girls.
(A) 10/21 (B) 9/21
(C) 15/21 (D) 14/21
(E) 15/41
10)
What is chance of throwing a number greater thon 4 with an
ordinary die whose faces are numbered from 1 to 6?
(A)
1/4
(B) 1/2
(C)
1/36
(D)
1/6
(E)
1/3
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