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the difference is negative 5 and the difference between 30 and 25 is 5. Some people look at the difference as absolute value so we have |25-30|=|30-25|=5
30
There are infinitely many prime numbers which are greater than 30.
It is: 10+25+30+35 = 100 and 100/4 = 25 which is the average mean value
There are two prime numbers between 20 and 30 which are 23 and 29