एक समान्तर श्रेणी में \(S_{18}=999\) और (d=5) है। प्रथम पद क्या होगा?
In an arithmetic progression \(S_{18}=999\) and (d=5). What is the first term?
Explanation opens after your attempt
B. (13)
Concept
From (999=9[2a+85]), (a=13). Exam tip: first divide both sides by (n/2).
Why this answer is correct
The correct answer is B. (13). From (999=9[2a+85]), (a=13). Exam tip: first divide both sides by (n/2).
Exam Tip
(999=9[2a+85]) से (a=13) मिलता है। परीक्षा में पहले दोनों ओर को (n/2) से भाग दें।
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