CMAT Exam Numerical Ability Permutation and Combination

jar contains 2 red balls and 4 green balls. What is the probability that two balls selected at random from the jar are both green?
A.1/12
B.1/4
C.2/5
D.None of the above

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CMAT Other Question
A merchant marks his goods up by 50% above his cost price. What is the maximum % discount that he can offer so that he ends up selling at no profit or loss?
A.25%
B.33%
C.50%
D.66% There are 3 boys A, B, C and 2 Girls D, E. D always sits to right of A. Girls never sit in extreme positions and in the middle position. C always sits in the extreme positions. Who is sitting immediate right to E?
A.A
B.B
C.C
D.A or C