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In a triangular decoration, beads are placed in rows from (1) to (19). How many beads are there in total?एक त्रिभुजाकार सजावट में (1) से (19) तक क्रमशः मोती रखे गए हैं। कुल मोती कितने हैं?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (190)(190)
Total beads are (S_{19}=\frac{19\times20}{2}=190). Triangular rows often give the sum of natural numbers.कुल मोती (S_{19}=\frac{19\times20}{2}=190) हैं। त्रिभुजाकार पंक्तियां अक्सर प्राकृतिक संख्याओं का योग देती हैं।
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