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There are just two ways in which 5 may b...

There are just two ways in which 5 may be expressed as the sum of two different positive (non-zero) integers, namely `5\ =\ 4\ +\ 1=\ 3\ +\ 2` . In how many ways, 9 can be expressed as the sum of two different positive (non-zero) integers? 3 (b) 4 (c) 5 (d) 6

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