Unformatted text preview: are possible? A2. How many diﬀerent words — meaningful or not — can be spelled using the letters of COLORADO? (Each letter is used exactly once. So, for example, all words are of length 8.) A3. What is the coeﬃcient of a 6 b 3 in the expansion of (7 a + 3 b + 2) 9 ? A4. What is the sum of all the coeﬃcients in the expansion of ( a + b + c + d + e ) 23 ?...
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 Spring '07
 Ledoan
 Zagreb, Highways in Croatia, following problems, Theoretical Exercises

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