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As a solution to the four fours problem (using the number four no more than four times to come up with the solution, 31 is equal to (4!+4)/4+4!

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โˆ™ 2010-02-23 16:32:36
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Q: How do you make 31 using only the number 4?
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What can you mulitply to get 31?

31 is prime so you can only multiply 1 and 31 to get 31. Using non-whole numbers you can get an infinite number of different options. For instance, 15.5 times 2 will make 31. Another example: 8 times 3.875 will also make 31.


How do you get the number 29 only using 1234?

2^(4+1)-3


How do you make 31 using 1 2 3 4 only once?

Very simple answer. ((4³) ÷ 2) - 1 = 31. Let's check out equation to verify its solution is the desired number. ((4³) ÷ 2) - 1 = 31 (64 ÷ 2) - 1 = 31 32 - 1 = 31 31 = 31.


How Many combinations can you come up with using 31 numbers and only 5 number combinations?

The answer is 31C5 = 31!/[26!5!] = 169,911


What times what equals 31?

31 times 1 = 31 As 31 is a prime number, the only whole numbers that do it are 1 × 31. There is another method using fractions. Ex: 15.5 x 2=31Only 1 times 31 = 31 . This is because 31 is a Prime number.


Is number 31 prime?

Yes, 31 can only divided by 1 and 31. So it is a prime number


Can you make the number 18 using only 8 4 2 and 1?

You can make every number up to 15 using only 8, 4, 2, and 1 .If you want to expand your horizons all the way to 18, you'll need the next onein the same series. That's 16. Once you have that, you'll be able to make everynumber up to 31 .


How do you get the number 31 only using 123 and 4 once?

2^3 Times 4 minus 1


How can you make the number 31 using 4 4's?

to get 31 using the number 4 exactly 4 times, you can do: (4! + 4)/4 + 4!4! is four factorial, which is 4x3x2x1, which is 24. So you have 24 + 4 = 28, /4 = 7, + 24 = 31.


How do you get the number 25 using 1234?

to get the number 25 using 1234 = 31 - 2 - 4


What times what 31?

1 and 31 are the only natural number that go into 31


Is 31 composite or prime?

The only positive integer factors of 31 are 1 and itself, therefore, it is prime.A prime number is defined as a number with only factors of 1 and itself. With this definition, 31 is a prime number because the only factors of 31 are 1 and 31.31 is a Prime Number.31 is a prime number because it has only two factors which are itself and one.


What two factors make the up the number 31?

1*31 It is a prime number


Factors of 31?

31 is a prime number, so the only factors it has is 1 and 31.


What are the factors for 31?

31 is a prime number so its only factors are 1 and 31.


What is the prime factalization of 31?

31 is a prime number. Its only prime factor is 31.


Can 31 be divided?

31 is a prime number so it can only be divided by 1 and 31.


What goes into 31 evenly?

Only 1 & 31... 31 is a prime number !


IS NUMBER 31 a prime or composite number?

31 is a prime number because it's only factor is 1.


How can you get the number 31 using 9 9 6 3 and 2 only using them once each?

9*9/3 + 6 - 2 = 9*3 + 6 - 2 = 27 + 6 - 2 = 31


How many prime numbers do 31 have?

31 is a prime number. Its only prime factor is 31.


What is the prime factorization of the number 31?

None. 31 is a prime number. Its only factors are 1 and itself.


What number goes into 18 and 31?

The only number that goes into 18 and 31 is 1.


What is a prime number 91 51 31 21?

31 is the only one that has only two factors: 1 and itself. It is the prime number.


Is 4 a common factor of 20 and 31?

no because 31 is not an even number. Therefore an even number can not be a factor of it. 31 is a prime number so the only factors it has are 1 and 31