Wipro Company Numerical Ability Probability

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

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Wipro Other Question

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
The probability of getting exactly 2 heads when 2 coins are tossed is
a)1/2 b)1/4 c)3/4 d)1/3