A man throws a die until he gets a number bigger than 3. The probability that he gets a 5 in the last throw is
A. 1/2
B. 1/3
C. 2/3
D. 3/5
Two cards aredrawn from a pack. The probability that one of them is a club and the other is not a club is
A. 1/36
B. 5/108
C. 26/51
D. 13/34
The letters of the word SUCCESS are arranged in a row at random. The probability that all S’s come together is
A. 3/35
B. 1/7
C. 3/7
D. 1/5
A five digit number is formed by using the digits 0, 1,2,3,4 and 5 without repetetion.The probability that the number is divisible by 6 is
A. 9/50
B. 10/39
C. 2/3
D. 1/16
A mapping is selected at random from the set of all mappings from the set A={1,2,3}in to B= {1,2,3,4}.The probability that the mapping selected is many to one is
A. 5/8
B. 3/8
C. 1/4
D. 24/64
5 digit numbers can be formed from the digits 0, 2,2,4,5. One number is selected at random.the probability that it is divisible by 5 is
A. 7/16
B. 1/16 1/16 1/26 7/26 1/16 1/26 7/26
C. 1/26
D. 7/26
One hundred cards are numbered from 1 to 100. The probability that a randomly chosen card has a digit 5 is
A. 1/100
B. 9/100
C. 19/100
D. none
If a number x is selected from natural numbers 1 to 100,then the probability for x+100/x >29 is
A. 41/50
B. 47/50
C. 39/50
D. 37/50
If 1+3p/3, 1-2p/2are the probability of two mutually exclusive events, then p lies
A. [-1/3,1/2]
B. (-1/2,1/2)
C. [-1/3,2/3]
D. [-1/2,2/3]
A, B, C are three routes from the house to the office. On any day, the route selected by the officer is independent of the climate. On a rainy day, the probabilities of reaching the office late, through these routes are 1/25, 1/10, 1/4respectively. If a rainy day the officer is late to the office then the probability that the route to be B is
A. 5/6
B. 7/40
C. 29/40
D. 10/39
If three six faced dice are thrown together, then the probability that the sum of the numbers appearing on the dice is k(3≤k≤8)is
A. (k-1)(k-2)/432
B. k(k-1)/432
C. k2/432
D. none
If n positive integers are taken at random and multiplied together , the probability that the last digit of the product is 2,4,6 or 8 is
A. 5n-3n/5n
B. 4n+2n/5n
C. 3n-2n/5n
D. 3n-2n/4n
Five digit numbers can be formed from the digits 1,2,3,4,5. If one number is selected at random, the probability that it is an even number is
A. 4/7
B. 2/5
C. 7/16
D. 1/16
A bag contains four balls. Two balls are drawn and found them to be white. The probability that all the balls are white is
A. 1/2
B. 3/5
C. 1/4
D. 4/6
If 3 cards are drawn from a pack of cards, then the probability for the cards to be a king, a queen and a jack is
A. 52/52C3
B. 64/52C3
C. 78/52C3
D. 84/52C3
If the probability that A and B will die with in a year are p and q respectively, then the probability that only one of them will be alive at the end of the year is
A. p+q
B. p+q-2pq
C. p+q-pq
D. p+q+pq
A bag contain 6 white and 4 black balls. A fair die is rolled and a number of balls equal to that appearing on the die is chosen from the bag at random. The probability that all the balls selected are white is
A. 1/5
B. 1/6
C. 1/7
D. 1/8
The vertex and focus of a parabola are (2, 1), (1, -1). Then the equation of the tangent at the vertex is
A. x+2y-6=0
B. x+2y-4=0
C. x+2y-9=0
D. x+2y-7=0
If one ticket is randomly selected from, tickets numbered from 1to 30 then the probabilitythat the numbered on the tickets i a multiple of 5 or 7 is
A. 1/3
B. 2/3
C. 4/3
D. 5/3
If the point of intersection of kx+4y+2=0, x-3y+5=0 lies on 2x+7y-3=0, then k=
A. 2
B. 3
C. -2
D. -3
A person has 3 shares in a lottery containing 2 prizes and 5 blanks. The chance of getting prize is
A. 3/10
B. 2/7
C. 5/7
D. 7/10
If P (A) =0.4, P (B) =0.5, P(C) =0.6, P (A∩B) =0.2, P (B∩C) =0.3, P (C∩A) =0.25, P (A∩B∩C) =0.1then P (AUBUC) =
A. 0.1
B. 0.9
C. 0.85
D. 0.8
The radical axis of the circles x2+y2-6x-4y-44=0 and x2+y2-14x-5y-24=0 is
A. 8x+y-30=0
B. 8x+y+20=0
C. 8x+3y-20=0
D. 8x+y-20=0
Bag A contains4 white, 3black balls.Bag B contains 3 white and 5 black balls.One ball is drawn from each bag .The probability that both are black is
A. 3/14
B. 15/56
C. 29/56
D. 4/5
The distance of (1, -2) from the common chord of x2+y2-5x+4y-2=0 and x2+y2-2x+8y+3=0 is
A. 2
B. 1
C. 0
D. 3
If the probability for A to fail in one exam is 0.2 and that of B is 0.3, then the probability that either A or B fails is
A. 0.14
B. 0.6
C. 0.44
D. 0.24
If 5 biscuits are distributed among 6 children, the probability that a particular child gets 4 sweets is
A. 10C4/ 610
B. 10C4*56/ 610
C. 10C4+56/ 610
D. 56/610
Three students A,B,C are to take part in a swimming competition. The probabilities of A ‘s winning or the probability of B’s winning of B’s winning is 3 times the probability of C’s winning. The probability of the event of either B or C to win is
A. 5/14
B. 3/7
C. 2/7
D. 4/7