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### Which number neither prime nor composite (1, 29, 39, None)...?

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```    1
```
##### Explanation

This question is about "Which number neither prime nor composite" Here we have to revised again Prime Number and Composite Number

```Prime number
```

A number is greater than 1 is called a prime number, if it has only two factors, 1 and the number itself i.e 2, 3, 5, 7, 11 ... also notice that prime number are start form 2.

```Composite Number
```

"A number that can be divided exactly by numbers other than 1 or itself is called a composite number" i.e 4, 6, 8, 9, 10... notice that 1 is not included in composite number and 2, 3 are in prime number list therefore composite number are starting from 4.

```1
```

1 has only one positive divisor that is itself. therefore 1 is not a prime number.
1 cannot be written as a product of two factors, so 1 is also not composite. 1 is also have a unique property that 1 is a number whose reciprocal is also itself which is also a whole number. Anyway 1 is neither prime nor composite number.

```29
```

29 has only two divisor 1 and 29 itself. Therefore 29 is a prime number.

```39
```

39 has four divisor 1, 3, 13 and 39. Therefore 39 is a composite number.

Therefore 29 is prime nubmer and 39 is composite. 1 is neithe prime nor composite number. So final answer is 1.

##### SHORTCUT TRICKS (Division)
• Divisible by 2 Shortcut trick
• Divisible by 3 Shortcut trick
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• Divisible by 5 Shortcut trick
• Divisible by 6 Shortcut trick
• Divisible by 7 Shortcut trick
• Divisible by 8 Shortcut trick
• Divisible by 9 Shortcut trick
• Divisible by 10 Shortcut trick

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