21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39.
All those not less than 20.
and the answer is 2,3,11,13,and 17.
All the prime numbers less than 20 are 2,3,5,7,11,13,17,19
A more formal definition for a number less than 20 could be, "a number x, x < 20" or if you want to express the set of all numbers less than 20 "{x | x < 20}" which is read "the set of all numbers x such that x is less than 20". In interval notation, you can write (-infinity, 20) where "infinity" should be replaced by the infinity symbol.
23 and 29 are the two prime numbers greater than 20 but less than 30.
All those not less than 20.
and the answer is 2,3,11,13,and 17.
The answer is 52.
15
All the prime numbers less than 20 are 2,3,5,7,11,13,17,19
A more formal definition for a number less than 20 could be, "a number x, x < 20" or if you want to express the set of all numbers less than 20 "{x | x < 20}" which is read "the set of all numbers x such that x is less than 20". In interval notation, you can write (-infinity, 20) where "infinity" should be replaced by the infinity symbol.
23 and 29 are the two prime numbers greater than 20 but less than 30.
There are more than one: 25, 36 and 49.
They are: 23+29 = 52
13 and 6
The largest prime less than 20 is 19. The largest prime over 60 is 61. The sum of these two numbers is 80.
'''They called composite numbers.''' '''Composite numbers are when they have more than two factors.''' '''A prime number is when it only has 2 factors no more or less.''' '''EX : 20''' '''Factors Of 20 : 1, 20, 2, 10, 4, 5.'''