BANK & INSURANCE (MISSING NUMBER SERIES PART 3)

Total Questions: 50

11. 12, 49, 200, ?, 3252, 13033

Correct Answer: (b) 809
Solution:

×4 + 1², ×4 + 2², ×4 + 3², ×4 + 4², ×4 + 5². So ? = 200×4 + 9 = 809.

12. ?, 17, 35, 71, 143, 287

Correct Answer: (c) 8
Solution:

Pattern: ×2 + 1. So first term = (17 − 1)/2 = 8.

13. 15, ?, 54, 170, 688, 3448

Correct Answer: (d) 23
Solution:

Pattern: ×1+8, ×2+8, ×3+8, ×4+8, ×5+8. So ? = 15×1 + 8 = 23.

14. 133, 157, 183, 211, ?, 273

Correct Answer: (a) 241
Solution:

Differences: +24, +26, +28, +30, +32. So ? = 211 + 30 = 241.

15. 250, 648, 686, 1536, 1458, ?

Correct Answer: (b) 3000
Solution:

Two interleaved patterns: 250=2×5³, 686=2×7³, 1458=2×9³; and 648=3×6³, 1536=3×8³, so next = 3×10³ = 3000.

16. 50, 52, ?, 70, 90, 120

Correct Answer: (c) 58
Solution:

Differences: +2, +6, +12, +20, +30 (increments +4, +6, +8, +10). So ? = 52 + 6 = 58.

17. 38, 58, ?, 158, 238, 338

Correct Answer: (d) 98
Solution:

Differences: +20, +40, +60, +80, +100. So ? = 58 + 40 = 98.

18. 9, 36, 144, 441, ?, 2304

Correct Answer: (a) 1089
Solution:

Squares of: 3, 6, 12, 21, 33, 48 (increments +3, +6, +9, +12, +15). So missing = 33² = 1089.

19. 81, 361, 841, 1521, 2401, ?

Correct Answer: (b) 3481
Solution:

These are squares: 9², 19², 29², 39², 49². Next is 59² = 3481.

20. 5, 10, 30, ?, 600, 3600

Correct Answer: (c) 120
Solution:

Multiply by 2, 3, 4, 5, 6. So ? = 30 × 4 = 120.