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Add 두-정수-사이의-합.js

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Original file line number	Diff line number	Diff line change
`@@ -17,3 +17,17 @@ function solution(a, b) {`
`17`	`17`	`}`
`18`	`18`	`return answer;`
`19`	`19`	`}`
	`20`	`+`
	`21`	`+//정답 3 - prove-ability`
	`22`	`+function solution(a, b) {`
	`23`	`+ let answer = 0;`
	`24`	`+ for(let i = Math.min(a, b), len = Math.max(a, b); i <= len; i++) {`
	`25`	`+ answer += i;`
	`26`	`+ }`
	`27`	`+ return answer;`
	`28`	`+}`
	`29`	`+`
	`30`	`+//정답 4 - prove-ability`
	`31`	`+function solution(a, b) {`
	`32`	`+ return Array.from({length: Math.max(a, b) - Math.min(a, b) + 1}, (_, i) => i + Math.min(a, b)).reduce((a, b) => a + b, 0);`
	`33`	`+}`

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