Can you complete this pattern?
My answer is:
All three parts combine together to form a 5*5 square. You may need to rotate the parts to fit in as second part in second row need to rotate to fit on top of part a and similarly part c need to rotate as well
Rotate 2nd part upside down and fit in 1st part so you left with blank space where option A fits well!
Please ask if explanation not clear;)
In every step, each column is replaced by a column of size smaller size that exists in the current formation. The shortest column is (are) removed and the remaining columns are shoved together.
Specific steps to obtain the third figure:
In the second step, the outer columns (height 2) are replaced by the middle column (height 1). The middle column has only one block (the smallest), so it is removed all together. The two outer columns are shoved together to obtain the answer.