Find the missing number in the triangle of circles

missing number puzzle - circles

Identify the logic of the above numbers in the grid of circles. This is a very simple and interesting number puzzle


The missing number is 25
Explanation:
Value of the circle = sum of upper two circles value
5=2+3, 7=3+4, 6=4+2
12=5+7, 13=7+6
25=12+13

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