(4) let (s) be a sequence satisfying |sn 2 - sn 11 ≤|sn 1-snl for all n € n. e (a) show that sm 1 - sml≤2·2-m|s₂ s₁ for all m e n. | s₁ for all n>m > 1. (b) show that isn - sml≤4.2m|s₂ -