Solution:The pattern followed here is :{(1st number ร 2) + 1} = 2nd number & {(2nd number ร 2) + 2} = 3rd number
(17, 35, 72) โ {(17 ร 2) + 1} = 35 & {(35 ร 2) + 2} = 72
(13, 27, 56) โ {(13 ร 2) + 1} = 27 & {(27 ร 2) + 2} = 56
Similarly,
(15, 31, 64) โ {(15 ร 2) + 1} = 31 & {(31 ร 2) + 2} = 64
Hence, "(15, 31, 64)" is the correct answer.