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geri wants to put 6 stamps on some pages in her stamp book and 9 stamps on other pages. how could she do this with stamp set of 78

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1 Answer

Hey Faizi -- we could make a "set" of 6+9 ... 5 "sets" makes 75 stamps ...
 
for 3 more, swap a "6" for a "9" ==> 4pX6 and 6pX9 works (24 plus 54) ... Regards :)