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Anna was playing with her calculator. She presses '9' and then '+' and then '19', then '+' then '9' and then '+' and '19' continuously. After a while she checks the result to be 3117. How many times did she pressed buttons on the calculator?

 Aug 21, 2020
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[3117 - 9] / 28 = 111 regular periods of 5 each.

 

111 x 5 + 1 ==556 Keysrokes to get 3117

 Aug 21, 2020

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