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Fruits plucked from a tree each day were (12,18,24,\ldots). How many fruits were plucked in the first (15) days?एक पेड़ पर प्रतिदिन फल तोड़े गए: (12,18,24,\ldots)। पहले (15) दिनों में कुल कितने फल तोड़े गए?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (810)(810)
The fifteenth term is (96), so the total is (S_{15}=\frac{15}{2}(12+96)=810) fruits. Treat the number of days as the number of terms.पंद्रहवाँ पद (96) है, इसलिए कुल (S_{15}=\frac{15}{2}(12+96)=810) फल हैं। दिनों की संख्या को पदों की संख्या मानें।
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