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U={whole number greater than 10 but smaller than 30 }
X={numbers divisible by 3 }
Y Odd numbers
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How can you tell whether a number is divisible by 3?
If the sum of its' digits are divisible by 3 for all numbers greater than 9.
Is 27 divisiable by all numbers?
NO, it is not divisible by all numbers. This is easy to see if you remember that 27 is an odd number and odd numbers are NOT divisible by 2. Then there is the issue that is is NOT divisible by any number greater than itself. That is a lots of numbers that don't work!
Why are not all odd numbers greater than 3 are prime numbers?
Because many of them are divisible by smaller odd numbers. For example 35 is divisible by 5 and so 35 cannot be a prime number.
Is all odd numbers greater than three are prime true or false?
False. An enormous number of them are divisible by three.
What are all the composite numbers between 89 and 97?
The numbers between 89 and 97 are: 90, 91, 92, 93, 94, 95, 96. All even numbers greater than 2 are composite. All numbers greater than 5 are divisible by 5 are composite. 93 is divisible by 3, so that only leaves 91 as a prime number. The composite numbers are 90, 92, 93, 94, 95, 96.
