Problem... Sheep

#Factors  #Area #Ratio #PrimeFactors #Combinations #Symmetry #MathsWithSheep

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Problem... Subfactorial

#Permutations #Factorial #Subfactorial #Derangements

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• For more see this from James Tanton.

Problem... Lego

#Probability #Combinations #Permutations #nCr #nPr
#Binomial #Venn #SimpsonsMaths #LegoMaths

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• See this about the Lego Ad campaign.