समान्तर श्रेणी \(12,19,26,\ldots\) के पहले (18) पदों का औसत क्या होगा?
What is the average of the first (18) terms of the arithmetic progression \(12,19,26,\ldots\)?
Explanation opens after your attempt
C. (71.5)
Concept
The last term is (12+17(7)=131), and the average is \(\frac{12+131}{2}=71.5\). Exam tip: the average of AP terms equals the average of first and last terms.
Why this answer is correct
The correct answer is C. (71.5). The last term is (12+17(7)=131), and the average is \(\frac{12+131}{2}=71.5\). Exam tip: the average of AP terms equals the average of first and last terms.
Exam Tip
अंतिम पद (12+17(7)=131) है और औसत \(\frac{12+131}{2}=71.5\) है। परीक्षा में समान्तर श्रेणी का औसत प्रथम और अंतिम पद का औसत होता है।
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