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RD Chapter 13 Probability Ex 13.1 Solutions

Question - 1 : - The probability that it will rain tomorrow is 0.85. What is the probability that it will not rain tomorrow ?

Answer - 1 : -


Question - 2 : -
A die is thrown. Find the probability of getting :
(i) a prime number
(ii) 2 or 4
(iii) a multiple of 2 or 3
(iv) an even prime number
(v) a number greater than 5 (CBSE 2008)
(vi) a number lying between 2 and 6 [NCERT]

Answer - 2 : -


Question - 3 : -
Three coins are tossed together. Find the probability of getting:
(i) exactly two heads
(ii) at most two heads
(iii) at least one head and one tail
(iv) no tails

Answer - 3 : -


Question - 4 : - A and B throw a pair of dice. If A throws 9, find B’s chance of throwing a higher number.

Answer - 4 : -


Question - 5 : - Two unbiased dice are thrown. Find the probability that the total of the numbers on the dice is greater than 10.

Answer - 5 : -


Question - 6 : -
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is
(i) a black king
(ii) either a black card or a king
(iii) black and a king
(iv) a jack, queen or a king
(v) neither a heart nor a king
(vi) spade or an ace
(vii) neither an ace nor a king
(viii) neither a red card nor a queen [CBSE 2005]
(ix) other than an ace
(x) a ten
(xi) a spade
(xii) a black card
(xiii)the seven of clubs
(xiv) jack
(xv) the ace of spades
(xvi) a queen
(xvii) a heart
(xviii) a red card
(xix) neither a king nor a queen [CBSE 2013]

Answer - 6 : -


Question - 7 : - In a lottery of 50 tickets numbered 1 to 50, one ticket is drawn. Find the probability that the drawn ticket bears a prime number.

Answer - 7 : -


Question - 8 : - An urn contains 10 red and 8 white balls. One ball is drawn at random. Find the probability that the ball drawn is white.

Answer - 8 : -


Question - 9 : -
A bag contains 3 red balls, 5 black balls and 4 white balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is:
(i) white?
(ii) red?
(iii) black?
(iv) not red? [CBSE2008]

Answer - 9 : -


Question - 10 : - What is the probability that a number selected from the numbers 1, 2, 3…… 15 is a multiple of 4 ?

Answer - 10 : -


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