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All the odd numbers between 1 and 2001.
The sum of all the odd numbers between 1 and 12000 is 36000000.
There are 44 odd numbers between the two.
There are 40 odd numbers between 20 and 100. Remember that an odd number is every second number. There are 80 numbers between 20 and 100, so there are 40 odd numbers and 40 even numbers.
There are 69 odd numbers between 20 and 158.