Find odd one in the series. 835, 734, 642, 751, 853, 981, 532

A. 734

B. 751

C. 981

D. 532

Solution:

Center digit in the numbers is the difference of 1st and last digit except 7551. For example: 835: 8-5 = 3, 734: 7-4=3, 642: 6-2=4 etc

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