Solutions
(11, 866, 13) = 133 – 113 = 866
Here, we see the middle number is the subtraction of cubes of 3rd and 1stnumber.
Therefore,
(18, 1736, 16) = 183 – 163 = 1736
(17, 817, 16) = 173 – 163 = 817
(13, 469, 12) = 133 – 123 = 469
(9, 602, 11) = 113 – 93 = 602
Hence, the correct answer is (9, 602, 11).