Problem... The 12 Days of Christmas

#Sequences, #GeneratingSequences, #TriangularNumbers
#Generalising, #WordProblem, #Series, #SummationOfSeries

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• For a solution, see this from MathsIsFun.
• To extend the activity, see this from nrich.

Problem... Five Sets

#PropertiesOfNumber #Sequences #Venn #Sets #SetNotation

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