1.1 KiB
1.1 KiB
| title |
|---|
| Sum square difference |
Problem 6: Sum square difference
Method:
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Sum of first n natural numbers can be calculated by using this formula:
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Sum of squares of n natural numbers can be calculated by using this formula:
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We can calculate the values using the above formula and subtract them to get the result.
Solution:
function sumSquareDifference(n) {
const sumOfN = (n*(n+1))/2;
const sumOfNSquare = (n*(n+1)*(2*n+1))/6;
//** is exponentaial operator added in ES7, it's equivalent to Math.pow(num, 2)`
return (sumOfN ** 2) - sumOfNSquare;
}