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There are 120 of them.
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.
The number of odd numbers between 38 and n = int[abs(n - 38)/2]
Odd numbers are those divided by two with remainder. Thus, between 5 and 8 there is be only one odd number 7.
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