31 students in a row were numbered 1,2,...,31 in order. The teacher wrote down a number on the blackboard.

Student 1 said "the number is divisible by 1",
Student 2 said "the number is divisible by 2",
and so forth...until
Student 31 said "the number is divisible by 31".

The teacher remarked: "Very well pups, but two of you gave a wrong statement, and those two sit besides each other". Determine those two.

Come on. I think that when we say "divisible" it's clear enough what is meant. After all, the problem goes away if you say that 3 is divisible by 2.(by your definition)

Posted by levik on 2002-05-08 20:29:44