Question

Probability
19. A box contains 19 balls bearing numbers 1, 2, 3, ..., 19 respective
ball is drawn at random from the box. Find the probability tha
number on the ball is
[CBS
(i) a prime number
(ii) divisible by 3 or 5
(iii) neither divisible by 5 nor by 10 (iv) an even number.
20. A box contains 20 balls bearing numbers 1, 2, 3, ..., 20 respectiv
ball is drawn at random from the box. What is the probability th
number on the ball is
(i) an odd number
(ii) divisible by 2 or 3
(iii) a prime number
(iv) not divisible by 10. [CBS
21. 15 cards numbered 1, 2, 3, 4, ..., 14, 15 are put in a box and
thoroughly. A man draws a card at random from the box. Fir
probability that the number on the card is
(i) an even number
(ii) a prime number
(iii) divisible by 3
(iv) divisible by 2 and 3.
22. Tickets numbered 2,3,4,5, ..., 100, 101 are placed in a box and
thoroughly. One ticket is drawn at random from the box. Fin
probability that the number on the ticket is
(i) an even number
(ii) a number less than 16
(iii) a number which is a perfect square
(iv) a prime number less than 40.
23. Cards marked with numbers 13, 14, 15, ..., 60 are placed in a b
mixed thoroughly. One card is drawn at random from the box. F
probability that the number on the drawn card is (i) divisib
(ii) a number which is a perfect square.
24. Cards, marked with numbers 5 to 50 are placed in a box and
thoroughly. A card is drawn from the box at random. Fi
probability that the number on the taken out card is (i) a prime
less than 10 (ii) a number which is a perfect square.
ICE
. 2. Jind the probability of getting 53 Fridays in a leap year.
26. If the probability of winning a game is 0.6, what is the probal
losing it?
(CE
(CBS
27. One card is drawn from a well-shuffled deck of 52 cards. F​

Answer 1

The correct option is: (C)

Explanation: Total number of possible outcomes = 19 (i) Prime numbers are 2, 3, 5,7 , 11, 13, 17 , 19. .'. Probability of numbers being prime = 8/19 (ii) Numbers divisible by 3 or 5 are 3, 5, 6, 9, 10, 12, 15, 18. .'. Required probability = 8/19 (iii) Numbers neither divisible by 5 nor by 10 are 1 , 2, 3, 4,6, 7, 8, 9, 11 , 12, 13, 14, ,16, 17 , 18, 19. .'. Required probability = 16/19 (iv) Even numbers are 2, 4, 6, 8, 10, 12, 14, 16, 18. .'. Required probability = 9/19

Answer 2

A number on a number line is first represented by the length of a line segment, that is, by the distance from the origin ZERO to the point. Then the endpoint of the line segment is used to represent the number, instead of the length.