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Compare numbers

Numbers can be compared with the well-known mathematical symbols. In the following examples, all expressions return the value true.
var v1 = 5 > 4;
var v2 = 5 >= 5;
var v3 = 5 < 6;
var v4 = 5 <= 5;


Write a function isThreeDigit that checks if a number is greater than or equal to 100 and less than 1000. isThreeDigit(500) should return true. The call isThreeDigit(50) should return false.