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Update Problem006.js (TheAlgorithms#1537)

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Original file line number	Diff line number	Diff line change
`@@ -1,11 +1,8 @@`
`1`	`1`	`// https://projecteuler.net/problem=6`
`2`	`2`
`3`	`3`	`export const squareDifference = (num = 100) => {`
`4`		`- let sumOfSquares = 0`
`5`		`- let sums = 0`
`6`		`- for (let i = 1; i <= num; i++) {`
`7`		`- sumOfSquares += i ** 2 // add squares to the sum of squares`
`8`		`- sums += i // add number to sum to square later`
`9`		`- }`
	`4`	`+ let sumOfSquares = (num)(num+1)(2*num+1)/6`
	`5`	`+ let sums = (num*(num+1))/2`
	`6`	`+`
`10`	`7`	`return sums ** 2 - sumOfSquares // difference of square of the total sum and sum of squares`
`11`	`8`	`}`

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