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

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.