A riddle that 99% of good math people answer incorrectly.

This is a math puzzle with 3 rows of X marks: 4, 6, 12, 1, 1 and 1, 9, 15, 2, 1 and 4, 9, ?, 2, 2. This problem requires you to find the pattern to guess the digit hidden after the question mark between the numbers 4, 9 and 2, 2.

This is an extremely difficult puzzle. To find the answer, take out a pen and paper, write it down, and calculate as meticulously as possible.

99% of people answer this riddle incorrectly.

If you find the most accurate answer, scroll down to the comments section to write down your correct answer and see how many people share your opinion.

Khanh Son

Source: https://vtcnews.vn/cau-do-khien-99-nguoi-gioi-toan-tra-loi-sai-ar907970.html