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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?
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Answer and explanation
Correct answer: (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.
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What is the correct answer to this question?
(378)
Why is this the correct answer?
Total dots are (S_{27}=\frac{27\times28}{2}=378). Having (k) dots in the (k)th row shows the sum of natural numbers.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Sum of first n natural numbers.
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