Solution:The pattern followed here is :{(Sum of the digits of 1st number) × 11} = 2nd number
(Add the reverse of second number with the 2nd number itself) = 3rd number
(56, 121, 242) → {(5 + 6) × 11} = 121 & (121 + 121) = 242
(78, 165, 726) → {((7 + 8) × 11} = 165 & (165 + 561) = 726
Similarly,
(36, 99, 198) → {(6 + 3) × 11} = 99 & (99 + 99) = 198
Hence, "(36, 99, 198)" is the correct answer.