C’è un simpatico (si fa per dire) giochino che chiede di ottenere 100 usando una volta le cifre da 1 a 9 in quest’ordine più vari operatori aritmetici: per esempio, 100=1+2+3+4+5+6+7+(8×9). Don Knuth ci ha pensato un po’ su, e … Continue reading →
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