If P= present population, I = average increase per decade, r = average incremental increase, n = no. of decades, then the mathematical expression given below is for which of the following population forecasting methods:
\(P_{n}=P+n I+\frac{n(n+1)}{2} r\)
1
Logistic method
2
Geometrical increase method
3
Arithmetical increase method
4
Incremental increase method