Refresh to get another 5 random questions

Seat couples

If the girlfriends of 3 couples are seated in fixed position around a table,
there is only one possible way to seat their boyfriends so that men and
women alternate ...


Black and White Sheep

A field contains a number of stationary black and white sheep. What simple condition will guarantee that a straight wire will exist which will separate the black sheep from the ...


A Simple & Crappy Clock

How many times a day is it impossible to tell the time by a clock with identical hour and minute hands, provided we can always tell whether it is a.m. ...

Tags: puzzle clock

Find the peak entry

Given an array A with n distinct entries, for some index p between 1 and n, the values in the array entries increase up to position p in A and ...


Determine the original word from relationships between letters

You are given a list of relationships between the letters in a single word, all of which are in the form: "The first occurrence of A comes before N occurrences ...