Created
August 27, 2020 05:50
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| function sumTo(n) { | |
| return n * (n + 1) / 2; | |
| } | |
| function solution(A) { | |
| // write your code in JavaScript (Node.js 8.9.4) | |
| let arraySum = A.reduce(function(acc, el) { return acc + el; }, 0); | |
| let sum =sumTo(A.length+1) | |
| return sum - arraySum | |
| } |
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