Question

2 sides of a triangle have a length of 6 and 6 what is the possibility for the 3rd side

Answer 1

Whenever you're given two sides of a triangle, say a and b, and are asked for the possible values for the length of the third side, it should always fall within this OPEN interval:
\[\Large \left(|a-b| \ , \ a+b\right)\]

Answer 2

0<x<6
0<x<12
6<x<12
12<x<18

Answer 3

All right, think of it this way, then:
\[\Large |a-b| < x < a+b\]

Answer 4

2nd option !!

Answer 5

0<x<12

Answer 6

That is correct :)