Friday, March 21, 2014

Add arithmetic operators to make 3 1 3 6 = 8 true

Problem:

Add arithmetic operators (plus, minus, times, divide) to make the following expression true: 3 1 3 6 = 8. You can use any parentheses you’d like.

Solution:


Method 1 - Hit and try
This is what I can think of : 
  1. we can first see 3+1+3+6 =13 No
  2. Multiplying is not solution either
  3. (3+1+3)/6 No
  4. 48/6 = 8 but 48 cannot be made by 3 1 3.
  5. 24/3 = 6*4 / 3 = 6 * (3 + 1) /3 ...hence we solved it.

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