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Q: What is the only prime number between 1 to 20 that can be written as a sum of 4 different prime numbers?

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The different between two different odd numbers are always an even number

Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.

There is no difference. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.

Rational numbers are numbers that can be written as a fraction. Real numbers are any number, including irrationals.

There are infinitely many numbers between any two different numbers. To find a number exactly in the middle between two numbers, calculate the average. That is, add the two numbers, then divide the result by 2.

There are infinitely many numbers between any two different numbers. One such, in this example, is 2.1756

Between any two different real numbers, there are infinitely many rational numbers.

Arithmetic can be written as two different products of prime numbers. haha

17 = 2 + 3 + 5 + 7

There are infinitely many numbers between any two different numbers. To get the number that is exactly in the middle, add the two numbers, then divide the result by 2.

Since the two numbers are the same, there is really no number that is strictly "between" them.In general, to calculate a number that is between two DIFFERENT numbers, just take the average of the two numbers. That will get you the number which is right in the middle between the two - which is just one of infinitely many numbers between them.

If there are parentheses around the numbers (two parentheses for each number) multiply them.

A rational number.

98

9

a rational number is different from a natural number because a rational number can be expressed as a fraction and natural numbers are just countinq numbers =D

Rational numbers can be represented in the form x/y but irrational numbers cannot.

An irrational number is a number that cannot be written as a ratio of two numbers.

An irrational number refers to one that can not be written as a ratio, or fraction, between two whole numbers.

These are decimals and there are an infinite number of numbers between these numbers.

20

the different between two odd numbers is an odd number.

17

1

There is no such thing. To specify that some number is "between" somthing, you must specify two different numbers, not just one.