A farmer must cross a river with a fox, a chicken, and a bag of grain. His boat can carry only himself plus one item at a time. He cannot leave the fox alone with the chicken, nor the chicken alone with the grain. How does he do it?
1. Take the chicken across. 2. Return alone. 3. Take the fox across. 4. Bring the chicken back. 5. Take the grain across. 6. Return alone and finally take