Explanation
To solve this series, we need to look at the first letter of the counting numbers in English.
1. Decoding the Pattern
Each letter in the sequence corresponds to the first letter of numbers starting from one:
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O → One
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T → Two
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T → Three
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F → Four
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F → Five
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S → Six
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S → Seven
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E → Eight
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N → Nine
2. Finding the Next Letter
Following the natural sequence of counting numbers, the next number after Nine is Ten.
Therefore, the next letter in the series is T.
Correct Option: (a) T