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Question 1

Given numbers: 4, 6, 9, 10
Result of expression: 10
Number of possible orderings and choices of operators:

Question 2

Given numbers: 3, 4, 6, 9
Result of expression: 3
Number of possible orderings and choices of operators:

Question 3

Given numbers: 5, 7, 8, 8
Result of expression: 51
Number of possible orderings and choices of operators:

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