In a geometric sequence, a1 =1000 and a6 = 0.32. Find r.

1.

In a geometric sequence, a10 = 2560 and r = 2. Find a1.

2.

In a geometric sequence, a1 = 3, r = 5 and an = 234375

3.

In a geometric series, s7 = 2499.968 and r = 0.2. Find a1.

4.

In a geometric series, sn = 10235, a1 = 5 and r = 2. Find n.

5.

In a geometric series, s6 = 4095 and a1 = 3. Find r.

6.