The lucky-number has become increasingly popular in daily life of modern sociality. For example, the number eight means big money which people like most, while the number four means death.

Some people believe lucky numbers so deeply that they will afford a telephone with numbers without four and others which is bad in their mind. They argue that the lucky-number really can bring good luck, and, at least, no evidence testifies they can not.

As far as I am concerned, there is no such relationship between the numbers and lucky, for the reason that numbers their self are given certain meaning for the purpose of application of mathematic. And, in addition, man should not depend on lucky which, in their mind, the numbers gives them.