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BdMO National Junior 2015#1

Posted: Tue Feb 19, 2019 10:41 am
by samiul_samin
A small country has a very simple language. People there have only two letters and all their words have exactly seven letters. Calculate the number maximum of words people use in that country?

Re: BdMO National Junior 2015#1

Posted: Tue Feb 19, 2019 11:12 am
by samiul_samin
Hint
Use $n^r$ formula
Answer
$\fbox {128}$