If the second and fifth terms of a GP are and respectively, then the sum of the first six terms is
Step 1: Solve for first term and common ratio
Given that second and fifth terms of a GP are and respectively i.e. and
We know that where, is the first term and is the common ratio
On dividing by , we get,
Step 2: Solve for sum of first six terms
We know that sum of terms of a G.P. is
Hence, the correct option is option (D) i.e. .