Discussion
Find the missing character from the given alternatives :
Answer: C
The missing number is 32.
In each triangle, the number inside is the product of the three outer numbers divided by 10:
\[ \begin{aligned} \frac{5 \times 6 \times 4}{10} &= \frac{120}{10} = 12 \\ \frac{6 \times 7 \times 5}{10} &= \frac{210}{10} = 21 \\ \frac{4 \times 8 \times 10}{10} &= \frac{320}{10} = 32 \end{aligned} \]
The rule matches both given triangles, so the third is 32. 22 is the sum of the outer numbers, and 30 and 42 do not follow the pattern.
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