A population of geese grow in such a way that each generation is simply 2.2 times the previous generation. There were 3 geese in the first generation, how many will there be by the 15th generation?
And so on. The general formula for the [tex]n[/tex]th generation is [tex]3\times2.2^{n-1}[/tex]. So by the 15th generation, you should expect around [tex]3\times2.2^{15-1}\approx186655[/tex] geese.