Let \( x \) and \( y \) be two numbers chosen at random from the se...

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Let \( x \) and \( y \) be two numbers chosen at random from the set \( \{1,2,3, \ldots, n\} \) with replacement. Let \( Q_{n}(p) \) denote the probability that \( \left(x^{p-1}-y^{p-1}\right) \) is divisible by \( p \).
\( Q_{25}(3) \) equals
(a) \( 0.5648 \)
(b) \( 0.5678 \)
(c) \( 0.5466 \)
(d) \( 0.5628 \)
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