books, and 5 geography ons 13- 14: You have 30 different books (10 math books, 1

Question

books, and 5 geography ons 13- 14: You have 30 different books (10 math books, 15 history books). 13. You pick two books a) (15/30)*(15/30) b) (15/30) (14/29) c) C(30,15) at random, one at a time. What is the probability that both books are history books? e) None of the above 14. You pick t wo books at random, one at a time. What is the probability that the two books are from diffe disciplines? a) (10*9+15*14+5*4)/(30*29) b) 1-(10+15+5)/(2*30) c) 1-(2/30) d) (1-(10*9+15*14+5*4)/(30*29)) e) None of the above

Explanation / Answer

13)
b) (15/30) * (14/29)
Probability of picking first book = 15/30
Probability of picking second book = 14/29

14)
d) (1 – (10*9+15*14+5*4)/(20*29))
Probability that two books are from diff disciplines = 1 – prob that books are from same discipline

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