Aptitude - Odd Man Out and Series - Discussion

Sir what is composite number example send to me?

Why 9 is wrong answer? Please any one explain me.

Will 7 is not in the series. It is question number.

This is a flawed question. They should update it.

They use the word 'composite' to mean non-prime. Every number is either prime (divisible only by itself and one) or non-prime (having factors other than itself and one).

The question uses a sequence of natural numbers: 7 4 6 8 9 10 11 12.

They describe every number except 11 as 'composite' (having other factors apart from itself and one) but 7 is also in that category. So they made a mistake. End of story.

I think 4 is divisible by 2.

6/3.
8/2.
9/3.
10/2.

11 is not divisible by 3.
12/2.

So 11 is odd man.

Number which are not prime is called composite numbers. 11 is prime number. Rest are composite numbers.

All numbers except prime numbers are known as composite numbers. Here 11 is a prime number so it is different.

COMPOSITE NUMBERS MEANS : NUMBERS WHICH ARE DIVIDED BY ITSELF AND ONE AND ALSO OTHER THAN ONE OR ITSELF. For e.g 9 is divided by one, it gets divided by itself (i.e 9) and also other numbers is 3. So 9 is comp.

Whereas 11 is divided by one and 11 itself but there is no other numbers except one and itself, so its not comp. OK, guys I hope you understand this :).

akhil answer is correct.

Yes.
A composite number is a positive integer which has a positive divisor other than one or itself. In other words a composite number is any positive integer greater than one that is not a prime number.