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A figure has (42) rows, and the (r)th row has (r) dots. How many dots will there be in total?एक चित्र में (42) पंक्तियां हैं और (r)वीं पंक्ति में (r) बिंदु हैं। कुल बिंदु कितने होंगे?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (903)(903)
Total dots are (S_{42}=\frac{42\times43}{2}=903). Having (r) dots in the (r)th row is the sum of natural numbers.कुल बिंदु (S_{42}=\frac{42\times43}{2}=903) हैं। (r)वीं पंक्ति में (r) बिंदु होना प्राकृतिक संख्याओं का योग है।
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