Wipro Company Numerical Ability Probability

A bag has 10 bulbs of which 3 are defective.If three bulbs are drawn in succession without replacement,the prabability of all the three being defective is
a)(3/10)^3 b)1/120 c)1/80 d)7/120

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Wipro Other Question
Out of first 20 natural numbers,one number is picked at random.The probability that it is wither an even number or a prime number is
a)1/2 b)16/19 c)4/5 d)17/20 If P(Aintersection B) = 0.2,P(A)=0.5 and P(AUB) = 0.7then P(B`)=
a)0.4 b)0.8 c)0.6 d)0.3