एक समान्तर श्रेणी में \(t_{15}=65\) और \(S_{15}=555\) है। सार्व अंतर क्या होगा?
In an arithmetic progression \(t_{15}=65\) and \(S_{15}=555\). What is the common difference?
Explanation opens after your attempt
B. (4)
Concept
From (555=\frac{15}{2}(a+65)), (a=9), and \(d=\frac{65-9}{14}=4\). Exam tip: use last term and sum to find the first term.
Why this answer is correct
The correct answer is B. (4). From (555=\frac{15}{2}(a+65)), (a=9), and \(d=\frac{65-9}{14}=4\). Exam tip: use last term and sum to find the first term.
Exam Tip
(555=\frac{15}{2}(a+65)) से (a=9) और \(d=\frac{65-9}{14}=4\) मिलता है। परीक्षा में अंतिम पद और योग से प्रथम पद निकालें।
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