what is the answer of this question?
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The answer is 120.
Explanation:
The number at the apex (top) of each triangle is the sum of the numbers on either side of its base.
For example,
In the lowermost row: 4 + 2 = 6, 2 + 5 = 7, 5 + 3 = 8, 3 + 1 = 4 and 1 + 6 = 7.
In the row just above the bottommost row: 6 + 7 = 13, 7 + 8 = 15, 8 + 4 = 12 and 4 + 7 = 11.
Therefore, the missing number is 58 + 62 = 120.
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