Question

If the 4th term and the 9th term of a gp are 8and 256 respectively then write the gp

Answer 1

a=1 & r=2

$ar ^{2} = 1 \times 2^{2} = 4$

$ar ^{3} = 1 \times 2^{3} = 8$

$ar ^{8} = 1 \times 2 ^{8} = 256$