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A staircase figure has (2211) tiles in total, and the (r)th row has (r) tiles. What is the number of rows?
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Answer and explanation
Correct answer: (66)
Total tiles are (S_r=2211), and (S_{66}=2211), so there are (66) rows. Such figures form a triangular number.
Frequently asked questions
What is the correct answer to this question?
(66)
Why is this the correct answer?
Total tiles are (S_r=2211), and (S_{66}=2211), so there are (66) rows. Such figures form a triangular number.
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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