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 Decimal Digits (Posted on 2014-09-02)

With respect to the decimal digits 0-9:

a) What is unique about 2?

b) What is common with 4, 5, and 6?

 Submitted by Bractals No Rating Solution: (Hide) Look at a digital watch - a decimal digit is displayed by turningon and off seven segments. Below are three lines: the first is a list of the ten digits, the second is a list of the number of segments turned off to display the decimal digit above, and the third is a list of the number of segments turned on to display the decimal digit. Clearly, the number in the second line plus the number in the third line is seven.``` 0 1 2 3 4 5 6 7 8 9 1 5 2 2 3 2 1 4 0 1 6 2 5 5 4 5 6 3 7 6 ``` a) Two is the only digit that equals the number of segments turned off to display itself. b) Four, five and six all equal the number of segments turned on to display themselves. How could I have worded the problem such that the difficulty level would not be d0?

 Subject Author Date re: Thoughts on (a) Dustin 2014-09-03 07:10:04 Trying yo guess... Ady TZIDON 2014-09-02 20:15:23 My thoughts Jer 2014-09-02 15:44:34 thoughts on (a) Charlie 2014-09-02 14:10:31 Thoughts on (a) Dustin 2014-09-02 13:54:19

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