Combinatorics › Pigeonhole and extremal problems

Extremal counting

Sign in for free to see the 17 problems in this skill. Sign in

More in Pigeonhole and extremal problems

Coloured beads and balloonsCoprime subsetsDivisibility chainsFamilies of setsForcing a sum conditionGuaranteed minimumMaximum sums in sequencesPairs and the pigeonhole principleParity arrangementsRamsey-type colouringsSmallest sums of setsSubsets avoiding differences