Previous in Permutation and Combination Next in Permutation and Combination | ||
Question Number 125460 by john_santu last updated on 11/Dec/20 | ||
$$\:{In}\:{a}\:{room}\:{containing}\:{N}\:{people} \\ $$$${N}>\mathrm{3},\:{at}\:{least}\:{one}\:{person}\:{has}\:{not} \\ $$$${shaken}\:{hands}\:{with}\:{everyone} \\ $$$${else}\:{in}\:{the}\:{room}.\:{What}\:{is}\:{the}\: \\ $$$${maximum}\:{number}\:{of}\:{people}\: \\ $$$${in}\:{the}\:{room}\:{that}\:{could}\:{have}\: \\ $$$${shaken}\:{hands}\:{with}\:{everyone}\: \\ $$$${else}?\: \\ $$ | ||
Answered by liberty last updated on 11/Dec/20 | ||
$${N}ā\mathrm{2} \\ $$ | ||