Q1: 10, 26, 74, 218, 654, 1946, 5834

ANS:D - 654

2^nd term = (1^st term) x 3 - 4 = 10 x 3 - 4 = 26. 3^rd term = (2^nd term) x 3 - 4 = 26 x 3 - 4 = 74. 4^th term = (3^th term) x 3 - 4 = 74 x 3 - 4 = 218. 5^th term = (4^th term) x 3 - 4 = 218 x 3 - 4 = 650.  5^th term must be 650 instead of 654.