13, 26, ....., ....., 52, 60, 104, 77, 208, 94

## Pembahasan

Pola deret: Dua barisan selang-seling.
- Barisan A (posisi ganjil, pos 1,3,5,7,9): 13, x, 52, 104, 208
- Barisan B (posisi genap, pos 2,4,6,8,10): 26, y, 60, 77, 94

Barisan A: 52 → ×2 → 104 → ×2 → 208 ✓; 13 → ×2 → 26; 26 → ×2 → 52 ✓
Jadi x = 26

Barisan B: 60, 77, 94 → beda tetap +17 ✓; 60 − 17 = 43; 26 + 17 = 43 ✓
Jadi y = 43

Verifikasi: 13, 26, 26, 43, 52, 60, 104, 77, 208, 94 ✓

Jawaban: A (26 dan 43)