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Question 1

Given numbers: 4, 8, 9, 9
Result of expression: 79
Number of possible orderings and choices of operators:

Question 2

Given numbers: 2, 2, 8, 10
Result of expression: 10
Number of possible orderings and choices of operators:

Question 3

Given numbers: 5, 5, 7, 10
Result of expression: 9
Number of possible orderings and choices of operators:

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