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Which of the following is an invalid variable name and why ?  3names, Integer, name.india, work_plan, jTextRavi, Kapil:Cricket

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Which of the following is an invalid variable name and why ? 

3names, Integer, name.india, work_plan, jTextRavi, Kapil:Cricket

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3 NAMES : INVALID STARTING WITH A NUMBER 

INTEGER AND JTEXTRAVI: KEYWORD 

NAME.INDIA KAPIL :CRICKET: INVALID AS HAVE SPECIAL CHARACTER 

WORK_PLAN : VALID

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