Computer Sciences > Gate 2014 Set-3 > 64
Which number does not belong in the series below?
2, 5, 10, 17, 26, 37, 50, 64
2, 5, 10, 17, 26, 37, 50, 64
Correct : Number Series
The correct answer is Option C: 64.
The series follows the pattern n2 + 1, where n starts from 1:
12 + 1 = 2 ✓
22 + 1 = 5 ✓
32 + 1 = 10 ✓
42 + 1 = 17 ✓
52 + 1 = 26 ✓
62 + 1 = 37 ✓
72 + 1 = 50 ✓
82 + 1 = 65 ✗ (series shows 64)
Every term fits the pattern perfectly except the last one. The 8th term should be 65, but the series shows 64 — making 64 the odd one out.
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