Wipro Company Numerical Ability Probability

If three balls are drawn at random from a bag containing 4 red and 7 green balls,the odds in favour of all being red is
a)12:13 b)4:161 c)161:4 d)3:121

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Wipro Other Question
A house wife buys a dozen eggs of which two turn out to be bad.If she chooses 4 eggs at random from the dozen to scramble for breakfast,the probability that she chooses all good eggs is
a)1/33 b)14/33 c)13/33 d)1/11 The probability that a number selected at random from the first 10 natural numbers is prime,is
a)3/5 b)3/10 c)7/10 d)2/5