题干
将下列句子与图片相匹配
⑴The cat is soft.____ A.
⑵The book is thin.____ B.
⑶The pencil is thick.____ C.
⑷Some drinks are hot.____ D.
⑸The toy car is hard.____ E.
⑴The cat is soft.____ A.
⑵The book is thin.____ B.
⑶The pencil is thick.____ C.
⑷Some drinks are hot.____ D.
⑸The toy car is hard.____ E.
答案(点此获取答案解析）
B,A,E,C,D
满足：
如果
为数列
的前n项和，那么
的概率为