An amoeba divides to form two amoeba after one hour.
After one hour, the total number of amoeba will be 2
Since, each of the amoeba is divided to form two amoebas after each hours
For 2 hours
The amoeba formed will be 2 x 2
The total number of amoebas after 2 hours is 4
For 3 hours
The amoeba will be 4 x 2
The total number