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Missing Number 1 Puzzle - Solution
The Puzzle:
What is the missing number in Triangle Four?
Our Solution:
The product of the two largest
minus the square of the smallest.
Example for Triangle One: 7x5-3x3 = 35-9 = 26
So the missing number in Triangle Four is = 9x5-4x4 = 45-16 = 29
Puzzle Author: Stephen Froggatt