गुणोत्तर श्रेढ़ी \(1,-3,9,-27,\ldots\) में \(a_7\) क्या होगा?
What will \(a_7\) be in the geometric progression \(1,-3,9,-27,\ldots\)?
Explanation opens after your attempt
C. (729)
Concept
Here (r=-3), so (a_7=1\cdot(-3)6=729). An even power of a negative ratio gives a positive value.
Why this answer is correct
The correct answer is C. (729). Here (r=-3), so (a_7=1\cdot(-3)6=729). An even power of a negative ratio gives a positive value.
Exam Tip
(r=-3) है, इसलिए (a_7=1\cdot(-3)6=729)। सम घात पर ऋणात्मक अनुपात का मान धनात्मक होता है।
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