35: the other numbers are all squares of integers. 2^2 = 4, 3^2 = 9, 4^2 = 16, 5^2 = 25, 6^2 != 35. The last number in the sequence should be 36.
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5, 15, 25, 35, 45.
The sum (done on a spreadsheet) of 1 to 35 as odd numbers is 1225.
Neither because only whole numbers can be odd or even
0.0286
35 x 25 = 875