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The following Python program runs in 44ms.

Solution:The total number of runs when the century was achieved is 103.There are two different ways that the century could be achieved:

or

In each case the century is scored off 55 balls, and in each case the score off the ball that gives the century could be a 4, taking the score from 99 to 103, or a 6, taking the score from 97 to 103.