How many terms of the G.P. 1, 4, 16, 64, …….. will make the sum 5461?

1. 6

2. 9

3. 7

4. 8

The sum of 7 terms of the G.P. 3, 6, 12, ………. is :

1. 181

2. 241

3. 381

4. 421