Nth Magical Number Binary Search Problem on Leetcode with Algorithm and Code

Nth Magical Number is a very interesting Binary Search based problem. It requires some background in mathematics (around Greatest Common Divisor and Least Common Multiple). This is explained in detail in this video with a code along walkthrough in JavaScript. 0:00 Problem description of nth magical number 0:35 Example 4:53 Intuition and conceptual understanding 9:31 Algorithm and dry run on an example 9:06 Coding the solution in JavaScript