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31 created by 4 successive integers (Posted on 2018-08-13) Difficulty: 2 of 5
Express 31 by 4 successive digits, using no more than 4 out of 5 basic operations (i.e. + - / * and exponentation), nothing else allowed.
No brackets!


The order of the digits must be an arithmetic progression like 8*7-6-5 or 3+4*5+6, examples fitting the specifications but not the result.

No Solution Yet Submitted by Ady TZIDON    
Rating: 3.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Hints/Tips Spoilers and expansion | Comment 2 of 7 |
a.  Straightforward answers:
6*5+4-3
4^3/2-1      ....might be others

b. Including concatenation   (not precluded by the text!):
32-1-0
32-1+0
32-1^0
-1-2+34
2+34-5            .....might be others

c, Extra challenge: Disregard   the  order, as long as you use
only digits a, a+1, a+2, a+3:
65-34
34-2-1
32-5+4
54-23             ....plenty of  others

The challenge is to expand lists a. b. and c. without introducing new operators - still no brackets. 

Will publish the comprehensive expanded solution.
 
Good luck!


Edited on August 14, 2018, 3:49 am
  Posted by Ady TZIDON on 2018-08-14 03:40:56

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