In Exercise determine which, if any, of the three statements are equivalent.
a) If 2 + 3 = 6, then 3+1=5.
b) 2 + 3 = 6 if and only if 3 + 1 ≠ 5.
c) If 3 + 1 ≠ 5, then 2 + 3 ≠ 6.
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