Sam and his 2 brothers read a combined 20 books during one summer. What's the probability that Sam read at least 8 books, if each brother read at least 5 books? A) $2/5$ B) $1/7$ C) $1/3$ D) $3/7$
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Let B1 be the number of books the first brother read. Let B2 be the number of books the second brother read. We are given that Sam and his 2 brothers read a combined 20 books: S + B1 + B2 = 20 We are also given that each brother read at least 5 books: B1 >= 5 B2 Show more…
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