the first 20, arre... 3.1459265358979323846
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The first ten numbers in pie are : 3.141592654 (the last 4 is from rounding it from the number below) The sixteen numbers of pie are: 3.141592653589793
3.14159265358979
The last digit in the product of the first 20 odd natural numbers can be determined by looking at the pattern of the units digit in the multiplication of consecutive odd numbers. The units digit of the product of consecutive odd numbers alternates between 1 and 5. Since there are 10 odd numbers between 1 and 19, and 20 is also an odd number, the last digit in the product of the first 20 odd natural numbers is 5.
Calculate n*(n+1)/2 for n=1, 2, 3, ... , 20.
They are 1*1, 2*2, 3*3 and so on, until 20*20. Use a calculator to work out the values.