3, 5, 9, 17, 33, 65, ....

## Pembahasan

Pola deret: Setiap suku = (suku sebelumnya × 2) − 1.

- 3 × 2 − 1 = 5 ✓
- 5 × 2 − 1 = 9 ✓
- 9 × 2 − 1 = 17 ✓
- 17 × 2 − 1 = 33 ✓
- 33 × 2 − 1 = 65 ✓
- 65 × 2 − 1 = 129

Jawaban: E (129)