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Question 1

Given numbers: 6, 8, 9, 10
Result of expression: 16
Number of possible orderings and choices of operators:

Question 2

Given numbers: 3, 7, 9, 9
Result of expression: 60
Number of possible orderings and choices of operators:

Question 3

Given numbers: 3, 5, 5, 8
Result of expression: 16
Number of possible orderings and choices of operators:


Questions and suggestions to Frank.Luebeck@Math.RWTH-Aachen.De.