Start with any number of counters in any number of piles. 2 players take it in turns to remove any number of counters from a single pile. The loser is the player who takes the last counter.
Let N be a six digit number with distinct digits. Find the number N given that the numbers N, 2N, 3N, 4N, 5N, 6N, when written underneath each other, form a latin square (that is each row and each column contains all six digits).
Find b where 3723(base 10) = 123(base b).
The following solution was recieved from Andrei of School 205 Bucharest. Well done and thank you Andrei.
Therefore both expressions can be factorised, so they are composite.