Complete the series: 17, 2, 51, 19, 3, .........?
- 87
- 95
- 56
- 57
Explanation
Odd positions (1st, 3rd, 5th):
17, 51, 3
- 17 × 3 = 51
- 51 ÷ 17 = 3
Pattern: ×3, ÷17
Even positions (2nd, 4th, 6th):
2, 19, ?
- 19 − 2 = 17
- So: 2 → +17 → 19
- 19 → +38 → 57
Seems it's increasing by:
+17, +38... (difference increasing by 21)
So the 6th number is 57
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