2^24 = 16,777,216 bacterias. Step-by-step explanation: So we start with 1 bacteria after 1 hours: 2*1 = 2 after 2 hours: 2*2 = 2^2 = 4 after 3 hours: 2*2^2 = 2^3 after n hours: 2^n Since one day has 24 hours we have n = 24 and total number of bacteria will be: 2^24 = 16,777,216 bacterias.