Infinitely many times; you can always subtract 2 from whatever number you have in the series 9 - 2n.
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The number of times can you subtract 50 by 2 is 25
a total of 25 times
The number is 2 because (6*2)-5 = 7
12 times, this question is really saying what is 24 divided by 2, 12
Just once - after that, you are no longer subtracting from 25.