Monday, 27 February 2017

Question of the day 28-2-2017

Directions for questions: 1 to 3: These questions are based on the following data.
                       A box contains 12 mangoes out of which 4 are spoilt. If four mangoes are chosen at random, find the probability that

1. All the four mangoes are spoiled.
     a. 1/495        b. 494/495          c. 1/395          d. 394/395
2. Not all the mangoes are spoiled.
    a. 1/495         b. 394/395         c. 494/495        d. 1/395 
3. Exactly three are not spoiled.
     a. 116/495      b. 224/495      c. 129/495          d. 187/495
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1 comment:

  1. Bhaskar Reddy27 February 2017 at 07:06

    Answer: Option a, c, b
    Explanation:

    1. Out of 12,8 are good and 4 are spoiled.
    Required probability = 4C4/12C4 = 1/495.

    2. Required probability = 1 – 1/495 = 494/495.

    3. Required probability = (8C3 * 4C1 )/12C4
    = (56 x 4)/495
    = 224/495.


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