Instant 60% far do cheannach
Àireamh de chùpain = 15 7 cùpain air an taghadh le fear eile. Mar sin, dòighean iomlan = 1 5 7 A-nis, airson 9 a bhith mar an fheadhainn as motha ann an cùpain taghte, mar sin bu chòir cùpain a thaghadh bho 1, 2, ... 9 A-mach às na 9 cùpain sin, ann an 7 cothroman, is urrainn dhuinn cùpain a thaghadh ann an 9 7 dòigh.
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