Equivalent forms of a conditional statement in words ('only if', 'or', necessary condition)

1. A.
   $p$ only if $q$
2. B.
   $q$ is a necessary condition for $p$
3. C.
   $\sim q$ implies $\sim p$
4. D.
   All of the above

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1. A.
   statement II is negation of statement I.
2. B.
   statement II is converse of statement I.
3. C.
   statement II and statement I are equivalent.
4. D.
   statement II is an inverse of statement I.

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1. A.
   If X is not an equilateral triangle, then X is not an isosceles triangle
2. B.
   X is neither isosceles nor equilateral triangle
3. C.
   X is isosceles but not an equilateral triangle
4. D.
   If X is not an isosceles triangle, then X is not an equilateral triangle.

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