If two sets \( A \) and \( B \) have \( p \) and \( q \) number of elements respectively and \( ...

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If two sets \( A \) and \( B \) have \( p \) and \( q \) number of elements respectively and \( f: A \rightarrow B \) is one-one, then the relation between \( p \) and \( q \) is
(a) \( p \geq q \)
(b) \( pq \)
(c) \( p \leq q \)
(d) \( p=q \)
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