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Recursive Formula For Arithmetic Sequence tn=d+t subn-1 Recursive Formula For Geometric Sequence tn=r X t subn-1 Explicit Formula for Arithmetic Sequence Tn=T1+(n-1)d Explicit Formula for Geometric Sequence tn=t1 X (r)^n-1 Partial Sum for Arithmetic Sequence Sn=n(t1+tn)/2 Partial Sum for Geometric Sequence Sn=t1(1-r^n)/1-r Sum of an Infinite Sequence S=t1/1-r -1<r<1