NCERT Class 11-Math's: Exemplar Chapter –16 Probability Part 9
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Question 16:
A sample space consists of 9 elementary outcomes whose probabilities are
Suppose
(a) Calculate , , and
(b) Using the addition law of probability, calculate
(c) List the composition of the event , and calculate by adding the probabilities of the elementary outcomes.
(d) Calculate from , also calculate directly from the elementary outcomes of
Answer:
(a
(b)
(c)
(d)
Question 17:
Determine the probability p, for each of the following events.
(a) An odd number appears in a single toss of a fair die.
(b) At least one head appears in two tosses of a fair coin.
(c) A king, 9 of hearts, or 3 of spades appears in drawing a single card from a well shuffled ordinary deck of 52 cards.
(d) The sum of 6 appears in a single toss of a pair of fair dice.
Answer:
(a)
(b)
(c)
(d)
Objective Type Questions
Choose the Correct Answer Out of Four Given Options in Each of the Exercises 18 to 29 (M.C.Q.)
Question 18:
In a non-leap year, the probability of having Tuesdays or Wednesdays is:
(A)
(B)
(C)
(D) None of these
Answer: (A)
Question 19:
Three numbers are chosen from 1 to 20. Find the probability that they are not consecutive
(A)
(B)
(C)
(D)
Answer: (B)
Question 20:
While shuffling a pack of playing cards, are accidentally dropped. Find the probability that the missing cards to be of different colours
(A)
(B)
(C)
(D)
Answer: (C)
Question 21:
Seven persons are to be seated in a row. The probability that two particular persons sit next to each other is
(A)
(B)
(C)
(D)
Answer: (C)
Question 22:
Without repetition of the numbers, four digit numbers are formed with the numbers . The probability of such a number divisible by is
(A)
(B)
(C)
(D)
Answer: (D)