Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11
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Two Dice Are Thrown Together. the Probability that at Least One Will Show Its Digit Greater than 3 is (A) 1/4 (B) 3/4 (C) 1/2 (D) 1/8 - Mathematics

MCQ

Two dice are thrown together. The probability that at least one will show its digit greater than 3 is

Options

  • 1/4

  •  3/4

  •  1/2

  • 1/8

     
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Solution

 3/4

When two dice are thrown, there are (6 × 6) = 36 outcomes.
The set of all these outcomes is the sample space, given by
S = (1, 1) , (1, 2), (1, 3), (1, 4), (1, 5), (1, 6)
      (2, 1) , (2, 2), (2, 3), (2, 4), (2, 5), (2, 6)
      (3, 1) , (3, 2), (3, 3), (3, 4), (3, 5), (3, 6)
      (4, 1) , (4, 2), (4, 3), (4, 4), (4, 5), (4, 6)
      (5, 1) , (5, 2), (5, 3), (5, 4), (5, 5), (5, 6)
      (6, 1) , (6, 2), (6, 3), (6, 4), (6, 5), (6, 6)
i.e. n(S) = 36
Let E be the event of getting at least one digit greater than 3.
Then E = {(1, 4), (1, 5), (1, 6), (2, 4), (2, 5), (2, 6), (3, 4), (3, 5), (3, 6), (4, 1) , (4, 2), (4, 3), (4, 4), (4, 5), (4, 6),
          (5, 1) , (5, 2), (5, 3), (5, 4), (5, 5), (5, 6), (6, 1) , (6, 2), (6, 3), (6, 4), (6, 5), (6, 6) }
∴  n(E) = 27
Hence, required probability = \[\frac{27}{36} = \frac{3}{4}\]

 

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APPEARS IN

RD Sharma Class 11 Mathematics Textbook
Chapter 33 Probability
Q 2 | Page 71
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