It is: 19 minus 1 = 18
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-20 is less than 19.
The set of odd numbers less than 19 includes all integers that are not divisible by 2 and are smaller than 19. These numbers are 1, 3, 5, 7, 9, 11, 13, 15, and 17. They form a finite set of numbers that are alternately spaced by a difference of 2.
n - 4 = 19
less than
8 over 19 is less than half of 19. Half of 19 is 9.8, and 8 is less than 9.5.