Determine the different combination — task. Mathematics State Board, Class 6.

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Answer variants:

$ryyy$

$yyry$

$yrry$

$ryry$

$ryyr$

$yryr$

$yyrr$

$yryy$

$rryy$

You have two red and two yellow blocks. How many different towers can you build that are four blocks high using these blocks? List all the possibilities.

[Note: Represent red colour block as '

$r$ ' and yellow colour block as '

$y$ ']

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2. Determine the different combination

Exercise condition: