## A general
approach to Number Series

The best way of
approaching the number series question, is to first observe the difference
between terms. If the difference is constant, it is a constant difference
series. If the difference is increasing or decreasing by a constant number,
then it is a series with a constant increasing or decreasing difference. If
there is no constant increasing or decreasing difference, then try out the
product series approach. For this, first divide the second term with the first
term, third with the second. and so on. If the numbers obtained are the same,
then it is a product series Alternatively, try - riling each term of the series
as a product of two factors and see it-there is any pattern that can he
observed. II' still there is no inference, but the difference is increasing or
decreasing in a rapid manner, then check out the square series. If the increase
is very high, and it is not a square series, then try out the cube series.

If
the difference is alternately decreasing and increasing tot increasing for some
time and alternately decreasing). Then it should most probably he a mixed
series. Therefore test out the series with alternate numbers. If still the
series is not solved, try out the general series.