Cards (7)
un= a+(n−1)d Sn= 2n(2a +(n−1)d) Sn= 2n(a + L) where a is the first term and L is the last term un= arn−1 Sn= 1−ra(1−rn) S∞= 1−ra It's an increasing sequence if un+1>un for all n It's a decreasing sequence if un+1<un for all n It's a period sequence if un+k=un for all n and its period/order is k