alleryకింది వాటిలో సంయుక్త సంఖ్య ఏది?
A19
B23
C29
D21
Answer & Solution
Correct answer: D. 21
21 కి 1, 3, 7 మరియు 21 కారణాంకాలుగా ఉన్నాయి, కనుక ఇది సంయుక్త సంఖ్య అవుతుంది. 19, 23 మరియు 29 ప్రధాన సంఖ్యలు.
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