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A box contain 12 ball out …

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A box contain 12 ball out of which x are black if one ball is drawn at random from box. What is the probability it will be black ball. If 12 more black ball are put in the box. Now the drawing is black ball is double of before find the value of x . No of black ball

    • Posted by Lalit Choudhary 6 years, 10 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Lalit Choudhary 6 years, 10 months ago

    Total ball = 12 No. Of balck ball = x P(e) = x /12 Now, 12 black ball are added Total ball = 24 Now, black ball = x + 12 P(e) = x+12/24 Now, according to the question, X+12/24=2×x/12 X+12/24×6=x X+12=4 X=4

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