Tell which number is prime 15 23 45 51
A.45
B.23
C.15
D.51
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I got 23 for the prime number
https://whatis.techtarget.com/definition/prime-number
Yeah, it's 23! @someone is right.
To determine which number is prime among 15, 23, 45, and 51, we need to check if each number is divisible by any other number except for 1 and itself.
Let's start with 15:
- We can check if 15 is divisible by any number from 2 to 14.
- Dividing 15 by 2 results in a remainder, so it is not divisible by 2.
- Dividing 15 by 3 results in a remainder, so it is not divisible by 3.
- Dividing 15 by 4 results in a remainder, so it is not divisible by 4.
- Dividing 15 by 5 gives us zero, which means it is divisible by 5.
Since 15 is divisible by 5, it is not a prime number.
Now let's move on to 23:
- We can check if 23 is divisible by any number from 2 to 22.
- Dividing 23 by any number between 2 and 22 results in a remainder, so it is not divisible by any other number.
Since 23 is not divisible by any number except for 1 and itself, it is a prime number.
Next is 45:
- We can check if 45 is divisible by any number from 2 to 44.
- Dividing 45 by 2 results in a remainder, so it is not divisible by 2.
- Dividing 45 by 3 results in zero, so it is divisible by 3.
Since 45 is divisible by 3, it is not a prime number.
Lastly, 51:
- We can check if 51 is divisible by any number from 2 to 50.
- Dividing 51 by 2 results in a remainder, so it is not divisible by 2.
- Dividing 51 by 3 results in zero, so it is divisible by 3.
- Dividing 51 by 17 results in zero, so it is divisible by 17.
Since 51 is divisible by both 3 and 17, it is not a prime number.
Based on our analysis, the only prime number among the given options is 23. Therefore, the answer is B.23.