docs: break down random number expression and evaluation order

Author: arunkumarakilan

Sprint-1/1-key-exercises/4-random.js

@@ -4,6 +4,17 @@ const maximum = 100;
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 console.log(num);
 // In this exercise, you will need to work out what num represents?
+// num represents random whole number between 1 to 100
+//It is generated by:
+//Creating a random decimal between 0 and 1 using Math.random()
+//Scaling it to the range 1 to 100
+//Rounding it down using Math.floor() so it becomes an integer
+
 // Try breaking down the expression and using documentation to explain what it means
 // It will help to think about the order in which expressions are evaluated
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+// Math.random() produces a random decimal number between 0 (inclusive) and 1 (exclusive). example : .10,.23 etc
+//it will never return 1
+// scale the random decimal number using multiplication with 100(maximum-minimum+1)
+//Math.floor() this method will remove the decimal part and return the nearest integer from 0 to 99 
+// +minimum will shift the range from 0 to 99  to  1 to 100.