Hello! Please see the attached screenshot where Greg explains that the answer is 10.

However, when I brute force it I am getting an answer that is different and is not available in the options:

Here is my explanation:

Multiples of 3: 3, 6, 9, 12, 15, 18

Multiples of 4: 4, 8, 12, 16

Possible combinations:

- 3 + 4 = 7
- 3 + 8 = 11
- 3 + 12 = 15
- 3 + 16 = 19
- 6 + 4 = 10
- 6 + 8 = 14
- 6 + 12 = 18
- 9 + 4 = 13
- 9 + 8 = 17
- 12 + 4 = 16
- 15 + 4 = 19

Can you tell me where I am going wrong? I am getting 11 answers and the option has 10. Greg in the video doesn’t go further than 8 selections since its obvious that nothing below 8 works and 19 is too big, so the answer is option D - 10.