Problemas de contagem são fascinantes, por serem tão simples de propor e, ao mesmo tempo… potencialmente difíceis de resolver, exigindo boa dose de criatividade. Além disso, frequentemente, são apresentados na forma de historinhas, do tipo: ‘João tem cinco camisas e três calças; de quantas maneiras…’ ou ‘em uma urna, temos bolinhas azuis, brancas e verdes; de quantos modos…’, o que dá a eles uma ‘concretude’ atraente.
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