Question

The eighth term of geometric progression is $128$ and common ratio is $2$. The product of the first five terms is

• A. $4^6$
• B. $4^5$
• C. $4^3$
• D. $4^7$

Answer 1

Answer: (B)

$4^5$

Given that eighth term of a G.P is $128$
=> $a\times r^{8-1}=128$
also given common ratio, $r=2$
Thus, we obtain first term $a=1$ from first equation
so the product of first 5 terms $1,r,r^2,r^3,r^4=r^{10}=2^{10}=4^5$