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Unformatted text preview: b ( n1) + 2( n1) . This gives a = 1 ,b =1 . 2. How many strings of four decimal digits (a) do not contain the same digit three times? 10 410 9 p 4 3 P (b) begin with an odd digit? 5 10 3 (c) have exactly two digits that are 4s? p 4 2 P 9 2 3. How many permutations of the letters ABCDEFG contain the string CFGA ? Show your work. p 4 1 P 3!...
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 Fall '09
 Egiceoclu

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