I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
Monday, June 27, 2011
A Counting Problem
How many terms are contained in (a + b + c)20 .
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2^20 or 1048576 termsReplyDelete
Er, should be 3^20, or 3486784401 terms.ReplyDelete
At least one. If a+b+c=1 then 1^20=1.ReplyDelete
3^20 is the number of terms not simplified, i.e., it woulb be a lot of identical terms that wwe can add up.ReplyDelete
The answer is "combinations", where n=3; r=20. The order is not important and repetition is allowed.