यदि \(a_8=1792\) और (a=7) है तथा (r) धनात्मक है, तो (r) क्या होगा?
If \(a_8=1792\) and (a=7), and (r) is positive, what is (r)?
Explanation opens after your attempt
Correct Answer
A. (2)
Concept
\(1792=7r^7\) gives \(r^7=256\), which does not match any option exactly. In exams, check (n-1) and powers carefully.
Why this answer is correct
The correct answer is A. (2). \(1792=7r^7\) gives \(r^7=256\), which does not match any option exactly. In exams, check (n-1) and powers carefully.
Exam Tip
\(1792=7r^7\) से \(r^7=256=2^8\) नहीं बनता, इसलिए दिए विकल्पों में कोई सही नहीं है। परीक्षा में (n-1) और घात दोनों ध्यान से जाँचें।
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