Four: 79 83 89 97.
The prime numbers from 75 through 100 are: 79, 83, 89, 97
75 composite numbers are there till 100. 100-25=75. Composite numbers are numbers greater than 1 but not prime numbers.
102
Including 1 and 100: 75 (73 if the range does not include 1 and 100.)
14
79, 83, 89, 97
Each of the 25 prime numbers from 1 to 100 has exactly two factors, 1 and the number itself. The other 75 numbers from 1 to 100 are not prime numbers because none of them have exactly two factors.
79 83 89 97
79 83 89 97.
79, 83, 89, and 97
It is: 25*75 = 1875
There are 25 prime numbers and 75 composite numbers from 1 to a 100. A prime number has only two factors whereas a composite number has more than two factors.