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So ... what's the hundredth number of the first question (1) on page 94 of the sixth grade elementary school math book?
Even terms are 9, 17, 26, 36, 47. ...
Their difference is 8,9, 10, 1 1 ...
So it can be judged that the 50th item is 9+8+9+10+1+...+55+56+57 =1577.
The 50th item of the even number is the 100 item of the whole series.