Question 10
Solve the illustrated $4 \times 4$ Ken Ken. Each row and column contains $1 , 2 , 3 , 4$. Each bold cage has an operation and target: $7$+ means sum $7 , 2$− difference $2 , 2 \div$ quotient $2$, and $4 \times$ product $4$. What is the starred cell?
