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Practice Time 14C

1. Abhishek throws a die. Find the probability of getting
(a) a number more than 3 (b) a prime number

(c) a composite number (d) a number co-prime with 2
2. What is the probability of choosing a vowel from 26 letters of the English alphabet?

5 5 26 21
(a) (b) (c) (d)
21 26 5 26
3. A die is tossed 60 times and the number 4 is obtained 12 times. The probability of getting number 4 is
1 1 1 1
(a) (b) (c) (d)
5 3 6 4

4. A card is drawn from a well-shuffled pack of 52 playing cards. Then find the probability that it is
(a) a king (b) a queen (c) a red card (d) a black card

(e) 10 of club (f ) king of spade
5. Numbers 1–20 are written on chits of paper and dropped in a box. What is the probability of

(a) choosing multiples of 10? (b) choosing an even number?
(c) choosing an odd prime number? (d) choosing a factor of 18?

6. There are 12 balls—2 red, 4 gold, 3 silver and 3 white. What is the probability of drawing:
(a) a silver ball? (b) a ball which is not red?
7. In a survey conducted on 100 students, it was found that 25 like Science, 70 like Maths and 5 like
Literature. What is the probability that randomly chosen student likes:

(a) Science (b) Maths (c) Literature
8. Ten pieces of paper marked 1 to 10 are kept in a box and mixed properly. What is the probability
of drawing a piece of paper

(a) with number 3 on it? (b) with prime number on it?
(c) with composite number on it? (d) with even number on it?

9. Some events are listed below. State which of the following events are certain, impossible or can
happen but not certain:
(a) Landing on a number less than 8 on spinning a spinner with 7 equal outcomes numbered 1 to 7.

(b) A 7-year-old boy will grow taller by the next year.
(c) A month having at least 4 Sundays.
(d) Riya will grow a year older on her birthday.

(e) Choosing a yellow marble from a jar containing 2 red, 3 blue and 4 green marbles.

(f) Mathematics teacher of class VII B not come tomorrow.
(g) Thirteen months in a year.

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