1.) 

If you have normal color vision, you'll see a 42.

Red colorblind people will see a 2.

Green colorblind people will only see a 4.

2.) 

If you have normal color vision, you see a 73 above.

If you are colorblind you will not see a number above.

3.) 

If you have normal color vision you'll see a 74 above.

If you are red green colorblind, you'll see a 21.

If you are totally colorblind you will not see a number above.

4.) 

If you have normal color vision you'll see a 26.

If you are red colorblind you will see a 6, if you're mildly red colorblind you'll see a faint 2 as well.

If you are green colorblind you'll see the a 2, and if you're mildly green colorblind a faint 6 as well.

5.) 

If you have normal color vision you'll see a 12.

If you do not see 12 you are a liar. Everyone can see this one!