In a class there are 170 students, 60 take Mathematics and Statistics, 40 take Mathematics only, and

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Question:

In a class there are 170 students, 60 take Mathematics and Statistics, 40 take
Mathematics only, and 50 take Statistics only, 60 take neither Mathematics nor
Statistics. Find
(a) Probability of picking a Mathematics or statistics student at random
(b) Probability of picking a Mathematics student or student who neither take
mathematics nor statistics