General Studies · Number Series
दिए गए विकल्पों में से वह संख्या चुनिए जो निम्नलिखित श्रृंखला में प्रश्नवाचक चिह्न (?) को प्रतिस्थापित कर सके।
12, 13, 15, 15, 18, 17, 21, ?
12, 13, 15, 15, 18, 17, 21, ?
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