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Mathematics : Probability

Mathematics : Probability

by Sanyam Kapoor -
Number of replies: 1
Please Help me with this question.
In reply to Sanyam Kapoor

Re: Mathematics : Probability

by Akhil killawala -
r1, r2, r3 ∈ {1, 2, 3, 4, 5, 6} 
r1, r2, r3 are of the form 3k, 3k + 1, 3k + 2 
Required probability = 3! * 2C1 * 2C1* 2C1 / 6*6*6
                                       =6*2*2*2/6*6*6
                                       =2/9 (c)
I THINK THIS SHOULD BE RIGHT WHTS THE ANSWER?