Created
December 9, 2014 11:35
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Codility-Lesson 1-Challenge 3
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| def solution(a) | |
| if a.length==0 | |
| 1 | |
| else | |
| sum=a.inject(:+) | |
| ((a.length+1)*(a.length+2)/2)-sum | |
| end | |
| end |
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