एक सड़क पर खंभों के बीच पहली दूरी (25) मीटर है और हर अगली दूरी (5) मीटर बढ़ती है। पहले (18) अंतरों की कुल दूरी कितनी होगी?
On a road the first gap between poles is (25) metres and each next gap increases by (5) metres. What is the total distance of the first (18) gaps?
Explanation opens after your attempt
B. (1215)
Concept
The distances are \(25,30,35,\ldots\) and \(S_{18}=1215\). Exam tip: take the number of gaps as the number of terms.
Why this answer is correct
The correct answer is B. (1215). The distances are \(25,30,35,\ldots\) and \(S_{18}=1215\). Exam tip: take the number of gaps as the number of terms.
Exam Tip
दूरियां \(25,30,35,\ldots\) हैं और \(S_{18}=1215\)। परीक्षा में अंतरालों की संख्या को पदों की संख्या मानें।
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