What is the probability that a randomly taken leap year has 52 Sundays?

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Step 1: A leap year has 366 days = 52 weeks + 2 extra days. The 2 extra days can be: (Mon, Tue), (Tue, Wed), (Wed, Thu), (Thu, Fri), (Fri, Sat), (Sat, Sun), (Sun, Mon). Favourable outcomes (no extra Sunday) = 5. $P(52 	ext{ Sundays}) = \frac{5}{7}$

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