Probability Set 4 – Quantitative Aptitude for IBPS/ SBI / RRB / CAT / CLAT / SSC / CGL / CHSL - Videos

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  2. 1st box x * 2nd box y * 3rd box x(blue only)

    Totally 4 possibilities, that are

    1) taking Blue from x –>6/10 (put it in y now 1 blue is added in y)

    Taking Blue from y–>5/11( now total is 11, blue is 5 and then 1 blue is added in to x)

    Taking Blue from x –>6/10 ( (before 1 blue taken from x) now blue is 6 and total 10)

    2) taking black from x–>4/10
    Taking black from y–>7/11
    Taking Blue from x–>6/10
    3) taking Blue from x–>6/10
    Taking black from y–>6/11
    Taking Blue from x–>5/10
    4) taking Black from x–>4/10
    Taking Blue from y–>4/11
    Taking Blue from x–>7/10

    (6/10 x 5/11 x 6/10) + (4/10 x 7/11 x 6/10) + (6/10 x 6/11 x 5/10) + (4/10 x 4/11 x 7/10) =640/1100=32/55

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