NDA Exam 2013 – Which number replaces the question mark?

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    8, 1

    The phrasing of the question (number instead of numbers) provides the clue that each pair of digits in a row forms a two-digit number.  So representing the grid as two-digit numbers we have:

    73, 46, 19  (delta -27)
    11, 9, 7  (delta -2)
    52, 42, 32  (delta -10)
    99, 50, 1  (delta -49)
    67, 82, 97  (delta 15)
    15, 48, 81  (delta 33)

    dougbell Genius Answered on 22nd October 2015.
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