A set can be found by writing upper limit and lower limit in between braces { }
So here we have to first determine what are upper and lower limits.
M natural numbers less than 5
Here we have two conditions:
Some books defined natural numbers are positive numbers like 1,2,3,,..... (excluding zero)
so in that case lower limit will be 1 and upper limit is 4
so set of M natural numbers less than 5 would be {1,2,3,4}
IN other case 0 is included, so we can say in that case
so set of M natural numbers less than 5 would be {0,1,2,3,4}