For each integer n ≥ 1, let pn be the number of legal strings with n letters that also read the same right to left as they do left to right (like 'xxxvxxx', for example). Which of the following expressions is equal to P101? OP50 +3P49 Ot50 + 3t48 Ot50 + t48 Ot100 +t99 OP100 + P99 Ot50 + 3t49 P50 + P49 Ot50+ t49

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