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A figure has (27) rows of dots, and the (k)th row has (k) dots. How many dots are there in total?एक चित्र में बिंदुओं की (27) पंक्तियाँ हैं और (k)वीं पंक्ति में (k) बिंदु हैं। कुल बिंदु कितने हैं?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (378)(378)
Total dots are (S_{27}=\frac{27\times28}{2}=378). Having (k) dots in the (k)th row shows the sum of natural numbers.कुल बिंदु (S_{27}=\frac{27\times28}{2}=378) होंगे। (k)वीं पंक्ति में (k) बिंदु होना प्राकृतिक संख्याओं का योग दिखाता है।
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