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ManishSManishS 

How to Populate custom formula field (Region) based on the Sd fields Area code and State?

I have created a custom formula field by name 'Region' under Lead object with Return Type= Text
 
Now based on the Postal Code and State, Region field should be populated by Region value.
eg:
Area Code
(PostalCode)  State                Region
205AlabamaEast251AlabamaEast256AlabamaEast334AlabamaEast907AlaskaWest480ArizonaWest520ArizonaWest602ArizonaWest623ArizonaWest928ArizonaWest479ArkansasWest501ArkansasWest870ArkansasWest209CaliforniaWest213CaliforniaWest310CaliforniaWest323CaliforniaWest408CaliforniaWest415CaliforniaWest424CaliforniaWest510CaliforniaWest530CaliforniaWest559CaliforniaWest562CaliforniaWest619CaliforniaWest626CaliforniaWest650CaliforniaWest661CaliforniaWest707CaliforniaWest714CaliforniaWest760CaliforniaWest805CaliforniaWest818CaliforniaWest831CaliforniaWest858CaliforniaWest909CaliforniaWest916CaliforniaWest925CaliforniaWest949CaliforniaWest303ColoradoWest719ColoradoWest720ColoradoWest970ColoradoWest203ConnecticutEast475ConnecticutEast860ConnecticutEast959ConnecticutEast302DelawareEast239FloridaEast305FloridaEast321FloridaEast352FloridaEast386FloridaEast407FloridaEast561FloridaEast727FloridaEast754FloridaEast772FloridaEast786FloridaEast813FloridaEast850FloridaEast863FloridaEast904FloridaEast941FloridaEast954FloridaEast229GeorgiaEast404GeorgiaEast470GeorgiaEast478GeorgiaEast678GeorgiaEast706GeorgiaEast770GeorgiaEast912GeorgiaEast808HawaiiWest
I tried using combinations of  OR and AND but no help in getting desired results.
 

IF

(AND

(OR

(POSTALCODE ="205",POSTALCODE ="251",POSTALCODE ="256",POSTALCODE ="334" ) ,(State ="Alabama" ) ,"East",

(POSTALCODE ="907",POSTALCODE ="480",POSTALCODE ="520",POSTALCODE ="602" ) ,(State ="Arizona" ),"West"

)

)

Am end up getting errors while running this syntax.
 
Any clues on this would save my day :-)
 
Regrds,
manish