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Q: What numbers make up the number 21?
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Is 21 a number in the Fibonacci sequence?

Yes, 21 is a number in the Fibonacci sequence. Numbers are usually found by adding up 2 numbers.


9999555533331111 in these any six numbers total is 21 what are those numbers?

5+5+5+5+1 That is only 5 numbers being added. There can be no answer for six numbers for the following reasons: The numbers are all odd. Two odd numbers make an even number. Two even numbers make an even number. 21 is odd. Take 6 odd numbers and add them up in pairs. Each pair of odd numbers gives an even number so there are 3 even numbers. Even + Even + Even = Even. So sum of any six odd numbers is even but 21 is not even.


Which pair of prime numbers make up 21?

3 x 7


What type of numbers make up the real number system?

Rational and irrational numbers.


How do you play 21 dares?

take it in turn to say up to 3 numbers. whoever says the number 21 has to to a dare. Hope this helps


What is a number that multiplies to get 21 and adds up to make 4?

25


What factors of a number equal 21?

When the "factors" of a number are listed, the list is usually restricted to positive factors. Then there would be no answer to the question, because no group of positive numbers can add up to make zero.


How many numbers make up a credit card number?

16


Is the addition of two composite numbers also a composite number?

Not necessarily. For example 15 and 16 are composite numbers. They add to 31, which is a prime number. Similarly, the composite numbers 20 and 21 add up to 41, which is a prime number.


What are two prime numbers whose sum is 42?

Split the number in half and make an equation adding the two together to make the desired amount. Unless the number that is half the total is prime, adjust the first number down by an amount to make it a prime number, then adjust the second one up by an equal amount and check whether it is also a prime number. If the second number is also a prime number, you have found two prime numbers that equal the desired amount. If not, adjust the first number down to another prime number, repeating the procedure above until you have two prime numbers.If you split 42 in half, the result is 21. Take the equation 21 + 21 = 42. Since 21 is not prime, adjust the first number down to 19 which is the first prime number below 21. That means the other number would be 23, which is prime. So, you have two prime numbers that add up to 42 = 19 + 23.The prime factorization of 42 is 2 x 3 x 7, so it has three factors that are prime: 2, 3, and 7.


What two consecutive numbers make up 420?

I am not sure if any two consecutive numbers can add up to an even number.


What is the average of 124 148 207 21?

Add the numbers up and then divide by the total number of numbers. Thus (124 + 148 + 207 + 21)/4 = 500/4 = 125