The pattern of the number is such that the sum of two number give the
square of the third number.
Response:
The possible rule in each diagram is as follows;
The sum of the number at the top and the number at he left is the
square of the number on the right.
Which gives;
Number on top, 21 + Number on the bottom left, 4 = 25 = 5² (square of the number to the right)
Similarly;
24 + 40 = 64 = 8²
Therefore;
20 + 16 = 36 = ?²
36 = 6²
Which gives;
?² = 6²
√(?²) = √(6²)
The missing number in the third diagram where there is a question mark, ? = 6
Learn more about patterns in numbers here:
https://brainly.com/question/1568434