Consider this option (this is not the only way): 1. according to the condition 2345N is divisible by <em>6</em>, it means, that N is even number (0;2;4;6 or 8). 2. <em>6</em>=3*2, then the number 2345N is divisible by 3 also. It means, that the number (2+3+4+5+N)=(14+N) is divisible by 3, where N={0|2|4|6|8}. 3. using items 1 and 2: (14+4)=18; only 18 is divided by 3, it means that N=4.
answer: 4.
Note also, that only 23451; 23454 and 23457 are divided by 3. Only 2345<u>4</u> is divided by 6 (2345<u>4</u>/6=3909).
