Hard Math Riddle Solution

The Solution

The Answer is: 52

Here, the pattern is +0, +3, +8, +15, …..

i.e. + (1 x 1 – 1), + (2 x 2 – 1), + (3 x 3 – 1) + (4 x 4 – 1), …..

Therefore, the missing number = 28 + (5 x 5 – 1) = 28 + 24 = 52