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Maths
pure
sequences and series
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Created by
Milan Savier
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Cards (3)
nth term of an arithmetic sequence
un
=
a
+ (
n-1
)
d
sum
of
arithmetic series
Sn
= n/
2
(
2a
+ (
n-1
)
d
)
nth term of a geometric sequence
un
=
ar
^(
n-1
)
a sequence is
increasing
if un+1 is
greater
than un
a sequence is
decreasing
if un+1 is
less
than un
