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Is 21 even or odd number?
An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2. 21 is an odd number.
What odd number between 11 and 21 is the product of two prime numbers?
13 is prime so it is not the number. 15 is the product of 3 and 5, two prime numbers, so it fits the conditions. 17 is prime so it is not the number. 19 is prime so it is not the number. 15 is the only odd number between 11 and 21 that fits the conditions. However, if 21 is included in the range, it also is the product of two prime numbers: 3 x 7.
What are the even numbers between 11 and 31?
13 15 17 19 21 23 25 27 29 31
What number is halfway between 18 and 21?
The number halfway between 18 and 21 can be found by taking the average of the two numbers. To do this, add 18 and 21 together to get 39, then divide by 2 to get 19.5. Therefore, the number halfway between 18 and 21 is 19.5.
What is 15 in hexadecimal number system represented by?
15 in the hexadecimal number system is represented by 21 in the decimal system.
