Find the missing number from the following given options:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 72
The number inside the first triangle is half the product of the three numbers on its sides. The same rule gives the missing number in the second triangle.
First triangle: \(\displaystyle \frac{4\times9\times3}{2}=\frac{108}{2}=54\), the number inside
Second triangle: \(\displaystyle \frac{6\times8\times3}{2}=\frac{144}{2}=72\)