एक स्वच्छता अभियान में पहले दिन (6) गलियां साफ हुईं और हर अगले दिन (3) गलियां अधिक साफ हुईं। (16) दिनों में कुल कितनी गलियां साफ होंगी?
In a cleanliness campaign (6) lanes are cleaned on the first day and (3) more lanes are cleaned each next day. How many lanes are cleaned in (16) days?
Explanation opens after your attempt
C. (456)
Concept
The lane numbers are \(6,9,12,\ldots\) and \(S_{16}=456\). Exam tip: treat a sequence with equal increase as an AP.
Why this answer is correct
The correct answer is C. (456). The lane numbers are \(6,9,12,\ldots\) and \(S_{16}=456\). Exam tip: treat a sequence with equal increase as an AP.
Exam Tip
गलियों की संख्या \(6,9,12,\ldots\) है और \(S_{16}=456\)। परीक्षा में समान वृद्धि वाली श्रेणी को ए.पी. मानें।
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