Solution:The pattern followed here is :{(1st number)² - 1} = 2nd number & (1st number + 1)² = 3rd number
(8, 63, 81) → 8² - 1 = 63 & (8 + 1)² = 81
(11, 120, 144) → 11² - 1 = 120 & (11 + 1)² = 144
Similarly,
(9, 80, 100) → 9² - 1 = 80 & (9 + 1)² = 100
Hence, "(9, 80, 100)" is the correct answer.