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tiny-mole [99]
3 years ago
13

A reading list contains 3 historical books and 4 science-fiction books. What is the probability that Tena will randomly choose a

historical book for her first repost and a science-fiction book for her second?
a. 12/49

b.2/9

c.2/7

d.1 2/7
Mathematics
1 answer:
murzikaleks [220]3 years ago
4 0
There are 7 books all in all. Since the order is important, there are 7P2 (permutation of 7 taken 2) ways in which Tena can do the repost. If she picks historical books first then followed by the science-fiction, there are
                                        3 x 4 = 12 ways. 
The probability is therefore equal to 12/(7P2) which is equal to 2/7. The answer is letter c. 
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