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Missing Number

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	`1`	`+Link: https://leetcode.com/problems/missing-number/`
	`2`	`+Language: C#`
	`3`	`+`
	`4`	`+`
	`5`	`+`
	`6`	`+`
	`7`	`+`
	`8`	`+`
	`9`	`+`
	`10`	`+public class Solution {`
	`11`	`+ public int MissingNumber(int[] nums)`
	`12`	`+ {`
	`13`	`+ int totalSum = (nums.Length + 1) * (nums.Length) / 2;`
	`14`	`+ int sum = 0;`
	`15`	`+`
	`16`	`+ for (int i = 0; i < nums.Length; i++)`
	`17`	`+ {`
	`18`	`+ sum += nums[i];`
	`19`	`+ }`
	`20`	`+`
	`21`	`+ return totalSum - sum;`
	`22`	`+ }`
	`23`	`+}`

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