BdMO National Junior 2015#1

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samiul_samin
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BdMO National Junior 2015#1

Unread post by samiul_samin » Tue Feb 19, 2019 10:41 am

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?

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samiul_samin
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Re: BdMO National Junior 2015#1

Unread post by samiul_samin » Tue Feb 19, 2019 11:12 am

Hint
Use $n^r$ formula
Answer
$\fbox {128}$

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