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What is a sequence?
1, 2, 3, 4…
What is a series?
1+2+3+4+….+10
Explicit Arithmetic
an = a1 + (n-1)•d
Recursive Arithmetic
an= { a1 ; n=1
……..an-1 + d ; n>1
Explicit Geometric
an = a1•r^n-1
Recursive Geometric
an = { a1 ; n=1
………an-1•r ; n>1
Sum of Finite Arithmetic Series
Sn = n (a1 + an)/2
Sum of finite geometric series
Sn = a1 (1-r^n)/(1-r)
Sum of infinite geometric series
|r|<1 ONLY, if |r|>1 then No Sum
Sn = a1/(1-r)
Sigma notation arithmetic
n S i=1 a1 + d
Sigma notation geometric
n S k=1 a1•r^k-1