What is 3333333333333333 /5555555555555555when reduced to lowest terms?

解析：本题主要是考察数学术语，reduced to lowest terms是指约分，也就是将该分数变为最简分数。因此，为3/5。

I wrote the squares of each of the first 100 positive integers in increasing order. What was the 50th integer that I wrote?

解析：以递增的方式写下前100个正整数的平方，那么第50个是多少？前一百个正整数，按照增序的方式第50个是50，50的平方是2500。

The number N = 2 666 666 . . . 666 666 consists of a “2” followed by 2019 “6”s. What is the remainder when N is divided by 11?

解析：N = 266666...666666666，数字 2 后面有 2019 个 6，N 除以 11 的余数是多少?N是2020位数，通过计算可知N除以11商是242424……从第二个数字开始，偶数位对应的商为2，奇数位对应的商为4，N最后一个数是第2020个数，为偶数位，因此，对应的商为2，6减去2等于4，因此余数为4。

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