A string of numbers by 1, 1, 2, 2, 3, 3, 4, 4, 5, 5 From the first number on the left, the 35th number is______ The sum of the first 36 numbers is______ ． | Math enthusiast | Mathematical art

A string of numbers by 1, 1, 2, 2, 3, 3, 4, 4, 5, 5 From the first number on the left, the 35th number is The sum of the first 36 numbers is ．

（35+1）÷2=18，（1+2+3+… +18) X 2 = (1 + 18) × 9 × 2 = 171 × 2 = 342; a: the 35th number is 18, and the sum of the first 36 numbers is 342

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