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RD Chapter 13 Probability Ex 13.1 Solutions

Question - 61 : - A number is selected at random from first 50 natural numbers. Find the probability that it is a multiple of 3 and 4.

Answer - 61 : -


Question - 62 : -
A dice is rolled twice. Find the probability that
(i) 5 will not come up either time.
(ii) 5 will come up exactly one time. [CBSE 2014]

Answer - 62 : -


Question - 63 : -
All the black face cards are removed from a pack of 52 cards. The remaining cards are well shuffled and then a card is drawn at random. Find the probability to getting a
(i) face card
(ii) red card
(iii) black card
(iv) king.

Answer - 63 : -


Question - 64 : -
Cards numbered from 11 to 60 are kept in a box. If a card is drawn at random from the box, find the probability that the number on the drawn cards is
(i) an odd number
(ii) a perfect square number
(iii) divisible by 5
(iv) a prime number less than 20. [CBSE 2014]

Answer - 64 : -


Question - 65 : -
All kings and queens are removed from a pack of 52 cards. The remaining cards are well-shuffled and then a card is randomly drawn from it. Find the probability that this card is
(i) a red face card
(ii) a black card. [CBSE 2014]

Answer - 65 : -


Question - 66 : -
All jacks, queens and kings are removed from a pack of 52 cards. The remaining cards are well-shuffled and then a card is randomly drawn from it. Find the probability that this cards is
(i) a black face card
(ii) a red card. [CBSE 2014]

Answer - 66 : -


Question - 67 : -
Red queens and blackjacks are removed from a pack of 52 playing cards. A cards is drawn at random from the remaining cards, after reshuffling them. Find the probability that the card drawn is
(i) a king
(ii) of red colour
(iii) a face card
(iv) a queen [CBSE 2014]

Answer - 67 : -


Question - 68 : - In a bag there are 44 identical cards with figure of circle or square on them. There are 24 circles, of which 9 are blue and rest are green and 20 squares of which 11 are blue and rest are green. One card is drawn from the bag at random. Find the probability that it has the figure of (i) square (ii) green colour, (iii) blue circle and (iv) green square. [CBSE 2015]

Answer - 68 : -


Question - 69 : - All red face cards are removed from a pack of playing cards. The remaining cards are well shuffled and then a card is drawn at random from them. Find the probability that the drawn card is (i) a red card, (ii) a face card and (ii) a card of clubs. [CBSE 2015]

Answer - 69 : -


Question - 70 : -
Two customers are visiting a particular shop in the same week (Monday to Saturday). Each is equally likely to visit the shop on any one day as on another. What is the probability that both will visit the shop on:
(i) the same day?
(ii) different days?
(iii) consecutive days?

Answer - 70 : -


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