Aptitude - Odd Man Out and Series - Discussion

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

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

Sir what is composite number example send to me?

{2*2=4, 4*1=4, 1*4=4}.....>.....4.

{3*2=6, 2*3=6, 6*1=6, 1*6=6}.....>.....6.

{4*2=8, 2*4=8, 8*1=8, 1*8=8}.....>.....8.

{3*3=9, 9*1=9, 1*9=9}.....>.....9.

{2*5=10, 5*2=10, 1*10=10, 10*1=10}.....>.....10.

{6*2=12, 2*6=12, 12*1=12, 1*12=12}.....>.....12.

All this no, have factors including factor of itself. Factor of it self i.e. [Example: 1*2, 2*1 ]. But only 11 in the option which has factors for itself we can't get 11 by multiplying with other no. s.

Its factor is {1*11, 11*1}.....>.....11.

This is the factors of 11. Now I hope Lavkush you may got atleast some idea why only 11 why not 9.

As per my point of view, the answer is 9.
Because,
2 * 2 = 4,
2 * 3 = 6,
2 * 4 = 8,
2 * 5 = 10, instead of 9 here 10 came so my answer is 9. Am I right?

What about 9?

11 is a prime number.

Simple 11 is prime number cannot multiple with any number.

11 is correct because 11 is the prime number.

Here the logic is;

Consider 4,8,10 and 12. They are divisible by 2. Now consider 6,9 and 11. 6 and 9 are divisible by 3 but 11 can't be divided by 3.

So the answer is 11.