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What is the expression used for population forecasting by the incremental increase method?

What is the expression used for population forecasting by the incremental increase method? Correct Answer PO + n*x + (n (n+1) /2) *y

The expression of the incremental increase method is given by PO + n*x + (n (n+1) /2) *y where PO is the present population, x is the average of the population increase in known decade, y is the average of incremental increase and n is the number of decades.

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