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If p if and only if q, then p is described as:

ANecessary but never sufficient
BSufficient but never necessary
CNeither necessary nor sufficient
DNecessary and sufficient for q
Answer & Solution
Correct answer: D. Necessary and sufficient for q
1. The implication runs both ways. 2. q if and only if p says the same. 3. So p is necessary and sufficient for q. _Source: syllabus Mathematics, Chapter 14, Mathematical Reasoning._
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