# Polya 4 Four different digits from 1 to 9 are required to open a safe. The sum of the digits is 20. The first digit

Polya 4 Four different digits from 1 to 9 are required to open a safe. The sum of the digits is 20. The first digit is greater than the third. The second and fourth digits differ by at least 5. Exactly two digits are squares. The first and fourth digits add up to a prime number. The fourth digit is the lowest. Can you find the four-digit combination? use Pólya’s 4 step process to solve. Label each step (1-4 with the title) and clearly describe what you did on each step.

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