Question 73

The members in each figure follow a similar pattern. Find the missing number.
[image]

Solution

In each circle the lower number is half the product of the two upper numbers, as $$\frac{8 \times 3}{2} = 12$$ and $$\frac{7 \times 6}{2} = 21$$. So the missing number is $$\frac{9 \times 4}{2} = 18$$.

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