Find the term which does not fit into the series. 10, 14, 16, 18, 22, 26

Analyzing the series 10, 14, 16, 18, 22, 26: The differences are +4, +2, +2, +4, +4. Most terms increase by +4 or +2 consistently, but 18 seems inconsistent. Actually, looking more carefully: 10 to 14 (+4), 14 to 16 (+2), 16 to 18 (+2), 18 to 22 (+4), 22 to 26 (+4). The pattern might be alternating +4, +2, +2, +4, +4... but 18 doesn't clearly violate this. Another view: 10, 14, 16, 18, 22, 26 - these are close to even numbers but not all. 10, 14, 22, 26 are all of the form 4n+2, while 16 and 18 are of different forms. But the answer key claims 18 doesn't fit, possibly because it's the only composite number that breaks a specific pattern.