Terms Flashcards
1
Q
General term of arithmetic sequences
A
Un=a+(n-1)d
2
Q
Sum of arithmetic sequences
A
Sn=n/2 x (2a+(n-1)d)
3
Q
Geometric sequences general term
A
Un=ar^n-1
4
Q
Sum of geometric sequences
A
Sn= a(1-r^n)/1-r
5
Q
Sum of infinity if lrl<1
A
S= a/(1-r)
