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Solution

Correct Option: 1

Pattern: centre value = a×b×c2\frac{a \times b \times c}{2}. First triangle: 4×9×32=54\frac{4 \times 9 \times 3}{2} = 54. Second triangle: 6×8×32=72\frac{6 \times 8 \times 3}{2} = 72. Hence the missing number is 72.

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