A) 15
B) 14
C) 13
D) 19
E) 20
Correct Answer: C
Solution :
Let nth term of GP is 2187 \[\therefore \] \[3{{(\sqrt{3})}^{n-1}}=2187\] \[\Rightarrow \] \[{{3}^{(n/2-1/2+1)}}={{3}^{7}}\] \[\Rightarrow \] \[\frac{n}{2}+\frac{1}{2}=7\] \[\Rightarrow \] \[n=13\]You need to login to perform this action.
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