Unformatted text preview: June. Answer: 10.9=0.1 (c) Find the probability that the household gets the low rate in May but not June. Answer: 0.70.6 = 0.1 3. DNA molecules consist of chemically linked sequences of the bases adenine, guanine, cytosine, and thymine, denoted A, G, C, and T. A sequence of three bases is called a codon . A base may appear more than once in a codon. (a) How many diﬀerent codons are there? Answer: 4 3 = 64 (b) The bases A and G are purines , while C and T are pyrimidines . How many codons are there whose ﬁrst and third bases are purines and whose second base is a pyrimidine? Answer: 2 3 = 8 4. Ten engineers have applied for a management position in a large ﬁrm. Four of them will be selected as ﬁnalists for the position. In how many ways can this selection be made? Answer: ( 10 4 ) = 10! 4!6! = 210...
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 Fall '08
 Kyung
 Statistics, DNA, cytosine, 10,000 gallons, low rate

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