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Merge pull requestneetcode-gh#47 from FelixRodriguezJr/patch-4

Create 268-Missing-Number.java

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	`1`	`+classSolution {`
	`2`	`+publicintmissingNumber(int[]nums) {`
	`3`	`+intsum =0;`
	`4`	`+inttotal =nums.length * (nums.length+1)/2;`
	`5`	`+for(inti =0;i <nums.length;i++){`
	`6`	`+sum +=nums[i];`
	`7`	`+ }`
	`8`	`+returntotal -sum;`
	`9`	`+ }`
	`10`	`+}`

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