Answer: B. 1/7¹⁸.
Step-by-step explanation: (7^‐²)⁹ (7^‐²) (7^‐²) (7^‐²) (7^‐²) (7^‐²) (7^‐²) (7^‐²) (7^‐²) (7^‐²) (1/(7) 7) (1/(7) 7) (1/(7) 7) (1/(7) 7) (1/(7) 7) (1/(7) 7) (1/(7) 7) (1/(7) 7) (1/(7) 7) 1/7¹⁸
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