perplexus.info :: Just Math : Broken Calculator II

Broken Calculator II (Posted on 2013-07-31)

A broken calculator has only the keys:
+(addition), -(subtraction), /(division), x(multiplication), =(equals)
It is a simple calculator that can do one binary operation at a time.
The only functional digit is 7.

How is it possible for 34 to appear in the readout in the fewest number of keystrokes?

Notes:

1. Performing as many operations as possible is allowed.

2. The digit 7 may be reused, that is expressions like 777x77 or, 7777+7 in a given operation is allowed.

No Solution Yet Submitted by K Sengupta

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Comments: ( Back to comment list | You must be logged in to post comments.)

possible way - spoiler

| Comment 1 of 3

-7/7+7+7+7+7+7

shows 34 . Maybe another stroke ( =) is needed.

Posted by Ady TZIDON on 2013-07-31 10:07:51

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