A:my parents
B:my parents'
C:my parents's
____ ____ ____ lunch. Let's go to the dining hall.
(Ⅰ)求数列{an}及{bn}的通项公式;
(Ⅱ)设数列{cn}的前n(n∈N*)项和为Tn,且 (Sn+n2)cn=1 ,求Tn.
读“中东地区示意图”,回答下列问题。