All numbers in the series 2, 3, 5, 7, 11, 13, 17, 19, 21, 23, 29 are prime except 21, which equals 3×7. Hence 21 is the odd one out.
CUET UG 2022 — General Test Quantitative Reasoning
Consider the series:
2, 3, 5, 7, 11, 13, 17, 19, 21, 23, 29
Find the number which is different from other similar numbers.
Held on 20 Aug 2022 · Verified 13 Jul 2026.
29
23
19
21
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