Nice mathematical and logical problems
(with discussions and solutions)
XPowerYEqualsYPowerX
ThreeNOTsUsingOnlyTwoNOTs
PlutoMeetsNeptun
NextNumberInSeries
LinesFromCoins
ProbabilityCoinSimulation
HeadUpVusTailUpCoins
Octomatics
EgyptianFractions
AnyNumberUsingOnlyThreeTWOs
AnyNumberUsingOnlyOneTWO
Spare119Cents
SelfDescribingNumber
DistinctDistanceLatticePoints
DeviceForSortFunction
PossiblyLoopedLinkedList
ThreePrisoners
IntelligenceTest3MenAroundTable