The virus spreads rapidly in the town. It infected the people - First day: 8, Second day: 16, Third day: 32. What will be the number of people infected on the next day?

Explanation

Each figure is double the one before, so the growth is geometric rather than arithmetic and the next term is 32 multiplied by 2, giving 64. Looking for a constant difference instead would suggest adding 16 to reach 48, which fits none of the options. Checking whether a series grows by a fixed amount or a fixed factor is always the first step.