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Answer

Correct Option is 565

Solution:
Logic:
Step I: Add 1 in even valued digit and subtract 1 in odd valued digit of each number.
Step II: Difference between two adjacent numbers.
Step III: Multiplication of numeral value of all digits of each number.
Step IV: Sum of two adjacent number.
Step V: Sum of the numeral value of all digits of each number.

2nd number from left in penultimate step=126 and 3rd number from right in step II=691; so, difference=691-126=565 

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