A) \[{{6}^{th}}\]
B) \[{{5}^{th}}\]
C) \[{{7}^{th}}\]
D) \[{{8}^{th}}\]
Correct Answer: B
Solution :
Given that first term \[a=5\] and common ratio \[r=-5\]. Suppose that \[{{n}^{th}}\]term is 3125, then \[a{{r}^{n-1}}=3125\Rightarrow 5{{(-5)}^{n-1}}=3125\Rightarrow {{(-5)}^{n-1}}={{5}^{4}}\] Hence\[\Rightarrow \].
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