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Finding sum of sequence upto a specified accuracy using JavaScript
Problem
Suppose the following sequence:
Seq: 1/1 , 1/1x2 , 1/1x2x3 , 1/1x2x3x4 , ....
The nth term of this sequence will be −
1 / 1*2*3 * ... n
We are required to write a JavaScript function that takes in a number n, and return the sum of first n terms of this sequence.
Example
Following is the code −
const num = 12;
const seriesSum = (num = 1) => {
let m = 1;
let n = 1;
for(let i = 2; i < num + 1; i++){
m *= i;
n += (m * -1);
};
return n;
};
console.log(seriesSum(num));Output
-522956311
Updated on: 17-Apr-2021
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