gate2017 numerical ability

Question

in a box 3 blue ,4 green and 3 red ball then the probability to choose two same color ball?

Comments

SIR IF SAME COLOR BALL IS SIMILAR MEANS MEANS 3 SAME RED BALL ,4 SAME GREEN BALL AND THEN  3 SAME BLUE BALL

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It's not same. Probability will be affected by the count, right?

Say in a box, there are 20 chocolates, 2 lollipops and 3 candies.

Probability that you will draw a chocolate will obviously be more. It can't be 1/3.

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THANK YOU SIR

Answer 1

try conditional probability method