Select the option that is related to the third number in the same way as the second number is related to the first number.
27 : 125 :: 343 : ?
27 : 125 $$\longrightarrow\ $$ 3$$^3$$ : (3+2)$$^3$$
343 : ? $$\longrightarrow\ $$ 7$$^3$$ : ?
Similarly, the required number = (7+2)$$^3$$ = 9$$^3$$ = 729
Hence, the correct answer is Option C
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