Correct Answer - Option 3 : (12, 21, 273)
Given,
(11, 17, 204)
The pattern followed here is,
(1st Number × 2nd Number) + 2nd Number = 4th Number
(11 × 17) + 17 = 204
187 + 17 = 204
204 = 204
Similarly,
(12 × 21) + 21 = 273
252 + 21 = 273
273 = 273
Hence, '(12, 21, 273)' is the correct answer.