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Population forecasting is used for calculating future populations.
There are many methods of this, incremental increase method is one of them.
The Incremental increase method is also a combination of the arithmetic increase and incremental increase method.
\[P n=P+n \cdot X+\left(\frac{n(n+1)}{2}\right) \cdot Y\]
where, Pn = population after the nth decade
X = average increase
Y = incremental increase