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Thread: Logical Reasoning

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    Logical Reasoning

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    A student is asked to pick marbles from a bag that contains 18 marbles. Eight marbles are red, 4 are green, and 6 are black. What is the minimum number of marbles that a blindfolded student would have to draw from the bag to be certain of having at least three marbles of the same color?
    A) 5
    B) 6
    C) 7
    D) 13
    E) 14

    Please post ur reasoning.

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    There are 3 different colours.
    To be certain that the student has selected atleast 3 marbles of same colour.
    Assume that he has pciked up 1 from each box.
    R G B
    1 1 1
    1 1 1
    After picking up first 6 balls in that way. Now he will have 2 from each colour. The 7th ball of any colour will satisfy the condition of atleast 3 marbles of same colour.

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    C
    Consider the worst case.
    Say the person started picking ang got 2 Red, 2 Green and 2 Blues. The 7th pick will 100% result in the condition "three marbles of the same color"

    Is this correct ?

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    IMO C..

    agree with Queen09 and venkat

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    C is the OA.
    What i thought that it meant 3 of the same colour at one pick!
    Then it becomes 14, which also happens to be an option (wrong one though).

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    Agree with Venkat's Reasoning, 7

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    1 red, 2 green, 2 blue, 2 red
    7 ans

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