Select the option in which the numbers shares the same relationship in set as that shared by the numbers in the given set. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g.13 - Operations on 13 such as adding /subtracting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)

(7, 21, 343)

(8, 24, 512)

(9, 27, 729)

(7, 21, 343)

(8, 24, 512)

The logic followed here is :

Ist number × 3 = Second number   and (Ist number)³ = IIIrd  number

as

7 × 3 = 21   and (7)³ = 343

8 × 3 = 24   and (8)³ = 512

same as in (9, 27, 729)

9 × 3 = 27   and (9)³ = 729