Mathematics · Arithmetic Progression
फूलों की एक क्यारी की पहली पंक्ति में 23 गुलाब के पौधे हैं, दूसरी में 21, तीसरी में 19 इत्यादि। यदि अंतिम पंक्ति में 5 गुलाब के पौधे हैं, तो क्यारी में पंक्तियों की संख्या कितनी है?
- 15
- 210✓
- 315
- 420
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10
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