गुणोत्तर श्रेढ़ी \(5,20,80,\ldots\) का (5)वाँ पद क्या है?
What is the (5)th term of the geometric progression \(5,20,80,\ldots\)?
Explanation opens after your attempt
B. (1280)
Concept
Here (r=4), so \(a_5=5\cdot4^4=1280\). The fifth term uses the ratio (4) times.
Why this answer is correct
The correct answer is B. (1280). Here (r=4), so \(a_5=5\cdot4^4=1280\). The fifth term uses the ratio (4) times.
Exam Tip
यहाँ (r=4), इसलिए \(a_5=5\cdot4^4=1280\)। (5)वें पद में (4) बार अनुपात लगता है।
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