समांतर श्रेढ़ी \(1,4,7,\ldots\) के पहले (11) पदों का योग कितना होगा?
What will be the sum of the first (11) terms of the arithmetic progression \(1,4,7,\ldots\)?
Explanation opens after your attempt
B. (176)
Concept
Here (a=1), (d=3), and (n=11), so \(S_{11}=176\). For an odd number of terms, you can also check using the middle term.
Why this answer is correct
The correct answer is B. (176). Here (a=1), (d=3), and (n=11), so \(S_{11}=176\). For an odd number of terms, you can also check using the middle term.
Exam Tip
यहाँ (a=1), (d=3), (n=11), इसलिए \(S_{11}=176\)। विषम संख्या के पदों में मध्य पद से भी योग जाँच सकते हैं।
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