A1=12−12,a2=23−13,a3=34−14,a4=45−15 ,a5=56−16. a1=12−12,a2=23−13,a3=34−14,a4=45−15 ,a5=56−16. a. find an explicit formula for anan: . b. determine whether the sequence is convergent or divergent: . (enter "convergent" or "divergent" as appropriate.) c. if it converges, find limn→∞an=limn→∞an= .