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Correct Option is 49

Solution:In this input output question only numbers is arranged in each step. Let us understand the logic behind it- In each step the numbers are arranged
Step I: According to the arrow Sum of 1st and 2nd block divided by 2 and so on.
Step II: Add 1st digit of each block and put in 1st block and add 2nd digit of each block and put in 2nd block.
Step III: Difference of 1st and 2nd block.
Square of number in Step III- 7*7=49 

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