If the sequence x1, x2, x3, …, xn, … is such that x1 = 3 and xn+1 = 2xn – 1 for n ≥ 1, then x20 – x19 =
A. 2^19
B. 2^20
C. 2^21
D. 2^20 - 1
E. 2^21 - 1
[spoiler]OA-A
IMO-C[/spoiler]
I doubt the OA
A. 2^19
B. 2^20
C. 2^21
D. 2^20 - 1
E. 2^21 - 1
[spoiler]OA-A
IMO-C[/spoiler]
I doubt the OA
