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NCERT Solutions for class 11 Maths | Chapter 16 - Probability

(1) Without repetition of the numbers, four digit numbers are formed with the numbers 0, 2, 3, 5. The probability of such a number divisible by 5 is
[A] 1/5
[B] 4/5
[C] 1/30
[D] 5/9
Answer: 5/9
(2) Seven persons are to be seated in a row. The probability that two particular persons sit next to each other is
[A] 1/3
[B] 1/6
[C] 2/7
[D] 1/2
Answer: 2/7

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(3) While shuffling a pack of 52 playing cards, 2 are accidentally dropped. Find the probability that the missing cards to be of different colours
[A] 29/52
[B] 1/2
[C] 26/51
[D] 27/51
Answer: 26/51
(4) Three numbers are chosen from 1 to 20. Find the probability that they are not consecutive
[A] 186/190
[B] 187/190
[C] 188/190
[D]
Answer: 187/190
(5) In a non-leap year, the probability of having 53 Tuesdays or 53 Wednesdays is
[A] 1/7
[B] 2/7
[C] 3/7
[D] none of these
Answer: 2/7
(6) Two fair dice are tossed. Let X be the event that the first die shows an even number, and Y be the event that the second die shows an odd number. The two events X and Y are
[A] mutually exclusive
[B] independent and mutually exclusive
[C] dependent
[D] Independent
Answer: Independent
(7) On his vacation, Rahul visits four cities (A, B, C, and D) in a random order. The probability that he visits A first and B last is
[A] 1/2
[B] 1/6
[C] 1/10
[D] 1/12
Answer: 1/12
(8) The probabilities that a student passes in Mathematics, Physics and Chemistry are m, p and c respectively . of these subjects, the student has a 75% chance of passing in at least one, a 50% chance of passing in at least two and 40% chance of passing in exactly two . Which of the following relations are true ?
[A] p + m + c = 19/20
[B] p + m + c = 27/20
[C] pmc = 1/10
[D] pms = 1/4
Answer: p + m + c = 27/20
(9) Two cards from a pack of 52 cards are lost. One card is drawn from the remaining cards. If drawn card is diamond then the probability that the lost cards were both hearts is
[A] 143/1176
[B] 143/11760
[C] 143/11706
[D] 134/11760
Answer: 143/11760
(10) One of the two mutually exclusive events must occur. If the chance of one is 2/3 of the other, then odds in favour of the other are
[A] 2:3
[B] 1:3
[C] 3:1
[D] 3:2
Answer: 3:2
(11) The probability of getting 53 Sundays in a leap year is
[A] 1/7
[B] 2/7
[C] 3/7
[D] None of these
Answer: 2/7
(12) Events A and B are independent if
[A] P (A ∩ B) = P (A/B) P (B)
[B] P (A ∩ B) = P (B/A) P (A)
[C] P (A ∩ B) = P (A) + P (B)
[D] P (A ∩ B) = P (A) * P (B)
Answer: P (A ∩ B) = P (A) * P (B)
(13) A dice is tossed for 4 times. The probability for getting 1 for minimum 1 time is
[A] 617/1269
[B] 617/1296
[C] 671/1269
[D] 671/1296
Answer: 671/1296
(14) A box contains 6 nails and 10 nuts. Half of the nails and half of the nuts are rusted. If one item is chosen at random, then the probability that it is rusted or a nail is
[A] 3/16
[B] 5/16
[C] 11/16
[D] 14/16
Answer: 11/16
(15) Seven white balls and three black balls are randomly placed in a row . The probability that no two black balls are placed adjacently equals
[A] 1/2
[B] 7/15
[C] 2/15
[D] 1/3
Answer: 7/15
(16) The probability that when a hand of 7 cards is drawn from a well-shuffled deck of 52 cards, it contains at least 3 Kings is
[A] 46/7735
[B] 46/7753
[C] 1/221
[D] None of these
Answer: 46/7735
(17) Two dice are thrown the events A, B, C are as follows A: Getting an odd number on the first die. B: Getting a total of 7 on the two dice. C: Getting a total of greater than or equal to 8 on the two dice. Then B C is equals to
[A] 15
[B] 19
[C] 21
[D] 23
Answer: 21
(18) Two unbiased dice are thrown. The probability that neither a doublet nor a total of 10 will appear is
[A] 3/5
[B] 2/7
[C] 5/7
[D] 7/9
Answer: 7/9
(19) Three distinguishable balls are distributed in three cells. The probability that all three occupy the same cell, given that at least two of them are in the same cell, is
[A] 1/3
[B] 1/5
[C] 1/7
[D] 1/9
Answer: 1/7
(20) A couple has two children. The probability that both children are males, if it is known that at least one of the children is male is
[A] 1/2
[B] 1/3
[C] 1/4
[D] 1/5
Answer: 1/3

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