Solution:The pattern followed here is :(a, b, c) → (a - b) = 7 & (c - b) = 21
(18, 25, 46) → (25 - 18) = 7 & (46 - 25) = 21
(24, 31, 52) → (31 - 24) = 7 & (52 - 31) = 21
Similarly,
(13, 20, 41) → (20 - 13) = 7 & (41 - 20) = 21
Hence, "(13, 20, 41)" is the correct answer.