यदि \(a_n=7\cdot2^{n-1}\) है, तो (1792) कौन-सा पद होगा?
If \(a_n=7\cdot2^{n-1}\), which term will be (1792)?
Explanation opens after your attempt
Correct Answer
B. नौवाँ पद(9)th term
Concept
From \(7\cdot2^{n-1}=1792\), \(2^{n-1}=256=2^8\), so (n=9). In exams, equate powers to find the term number.
Why this answer is correct
The correct answer is B. नौवाँ पद / (9)th term. From \(7\cdot2^{n-1}=1792\), \(2^{n-1}=256=2^8\), so (n=9). In exams, equate powers to find the term number.
Exam Tip
\(7\cdot2^{n-1}=1792\) से \(2^{n-1}=256=2^8\), इसलिए (n=9) है। परीक्षा में घातों को बराबर करके पद संख्या निकालें।
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