Simplify the expression given below. 3^5 - (1/3)^(-5) + sqrt((27^12 + 9^13)/(27^6 + 9^14))

Answer: D. 81

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Source: RRB NTPC Under-Graduate CBT-2 response sheet 20-Dec-2025 (candidate-shared copy of official answer-key viewing) · official-answer-key