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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