यदि क्रम \(5,20,80,320,\ldots\) में \(a_n=1280\) है, तो (n) क्या है?
If \(a_n=1280\) in the sequence \(5,20,80,320,\ldots\), what is (n)?
Explanation opens after your attempt
B. (5)
Concept
The sequence is (5,20,80,320,1280). (1280) is the fifth term, so (n=5).
Why this answer is correct
The correct answer is B. (5). The sequence is (5,20,80,320,1280). (1280) is the fifth term, so (n=5).
Exam Tip
क्रम (5,20,80,320,1280) है। (1280) पाँचवाँ पद है, इसलिए (n=5)।
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