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?
Options:
A . 3
B . 4
C . 5
D . 6
Answer: Option B Answer: (b) 9 = 1+8 = 2+7 = 3+6 = 4+5 So it can be expressed in 4 ways
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