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Why are prime numbers prime?
A prime number is any number that only has one and itself as factors. Therefore, to tell if a number is prime simply find it's factors. If it has more than two factors than it is not a prime number.
How come 57 is a composite number?
A prime number has exactly two factors, 1 and the number itself. 57 is a composite number because it has more than two factors. The factors of 57 are 1, 3, 19, and 57.
What are the set of numbers that when multiplied will make a certain number?
They are that number's factors.If its the complete set of the smallest such numbers, they are the prime factors.What's the difference? 4 and 15 are factors of 60: 4 x 15 = 60.But the prime factors of 60 are 2 x 2 x 3 x 5. (Note that these are all prime numbers, which is where the term comes from.)By multiplying the prime factors in different combinations -- such as 2 x (2 x 3) x 5 -- we can come up with all the possible combinations which lead to the original number.Also note that the only prime factor of a prime number is itself. Some teachers will tell you that the factors of a prime number are itself and 1, which is also true: 1 (known as unity) is special in that every number, when divided by it, remains the same. But 1 itself is not considered a prime number.
How many times will the number 4 come up if you toss a 6 sided die 30 times?
The actual number of times 4 comes up is impossible to find, but the expected value of 4 coming up if you toss a 6-sided die 30 times is 5 times.
What is number of trials?
Number of trials is how many times you test your hypothesis. When you are doing trials the end result may come out differently every time.
