In this expression 1 1 1 1 1 3 4 5 6 7 we place either a plus sign or a minus sign in each box so that the result is the smallest positive number possible. The result is
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between 0 and 1 100
between 1 1 and 100 50
between 1 1 and 50 20
between 1 1 and 20 10
between 1 and 1 10
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Australian Mathematics Competition 2018 - Junior (2018)
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