एक सीढ़ी में ईंटों की संख्या \(3,6,9,\ldots\) है। पहले (12) स्तरों में कुल कितनी ईंटें लगेंगी?
In a staircase, the number of bricks is \(3,6,9,\ldots\). How many bricks will be used in the first (12) levels?
Explanation opens after your attempt
D. (234)
Concept
This is the sum of the first (12) multiples of (3), so \(3\times78=234\). Treat the number of levels as (n).
Why this answer is correct
The correct answer is D. (234). This is the sum of the first (12) multiples of (3), so \(3\times78=234\). Treat the number of levels as (n).
Exam Tip
यह (3) के पहले (12) गुणजों का योग है, इसलिए \(3\times78=234\)। स्तरों की संख्या को (n) मानें।
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