30 is an even number. 30 is equal to: 2 + 4 + 6 + 8 + 10; 4 + 5 + 6 + 7 + 8; 2 + 3 + 5 + 8 + 12; 6 + 7 + 8 + 9; and 1 + 4 + 9 + 16.
1+1+1+3+3+3+3 = 15 = 30 in base 5. Then 1+1+3+5+5+5+7 = 27 in base 9.
To tell whether a number is even or odd, look at the number in the ones place. That single number will tell you whether the entire number is odd or even. An even number ends in 0, 2, 4, 6, or 8. An odd number ends in 1, 3, 5, 7, or 9.
The sum of three odd numbers is indeed odd. But not every number on that list is odd. Can you see how to use the even number on that list to get the answer? If you remove 10, then you're right, unless there is some trick solution (viewing 30 as in a base other than 10, or something silly like that).
There are at least two combinations of two
numbers that you can
multiply together to get
30.
For your convenience, we have made a list of all the combinations of two numbers multiplied by each other that will make 30:
- x 30 = 30.
- x 15 = 30.
- x 10 = 30.
When a number has more than two factors it is called a composite number. Here are the first few prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, etc.
Below is a list of all the different ways that what times what equals 30.
- times 30 equals 30.
- times 15 equals 30.
- times 10 equals 30.
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Solution for level Brain Out What 3 numbers add up to 12 answer: 3+3+6=12, just follow the walkthrough =)
The factorial, symbolized by an exclamation mark (!), is a quantity defined for all integer s greater than or equal to 0. For an integer n greater than or equal to 1, the factorial is the product of all integers less than or equal to n but greater than or equal to 1. The factorial is of interest to number theorists.
A
factorial is a function that multiplies a number by every number below it. For example 5!= 5*4*3*2*1=120.
What is a Factorial?
- 2 factorial is 2! = 2 x 1 = 2.
- 4 factorial is 4! = 4 x 3 x 2 x 1 = 24.
- 5 factorial is 5! = 5 x 4 x 3 x 2 x 1 = 120.
- 0 factorial is a definition: 0! = 1.
Give it a couple more minutes, try to think outside of the box (haha, sorry for the pun). And no, the answer is neither six nor nine.
5, 4, 1}, {15, 5, 3, 2}, {15, 4, 4, 2}, {15, 4, 3, 3}, {14, 9, 1, 1}, {14, 8, 2, 1}, {14, 7, 3, 1}, {14, 7, 2, 2}, {14, 6, 4, 1}, {14, 6, 3, 2
15 + 15 is 30, but 15 times 15 is 225, so one of the numbers is higher than 15 and one of the numbers is lower than fifteen.
The result of adding two or more numbers. Example: 9 is the sum of 2, 4 and 3. (because 2 + 4 + 3 = 9).
When two numbers are added together, the result is called a sum. The two numbers being added together are called addends.
The sum of 5, 6, 7, 8, and 9 is 35. Of these five numbers, 5 and 7 are prime numbers.
As you say, the
sum of those
numbers is
23.
By this way, those are the numbers:
- The first number 2,6.
- The second 3,6.
- The third 4,6.
- The fourth 5,6.
- The fifth 6,6.
36 is a composite number, and it is 6 squared. 36 = 1 x 36, 2 x 18, 3 x 12, 4 x 9, or 6 x 6. Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36.
Now if you add any two odd numbers together, the sum will be even, so adding any five odd numbers is the same as adding one odd number to one even number. So: (2n+1)+(2n)=50. 4n+1–1=50–1.
