The combined area of the Atlantic, the indian Oce3an and the
Meditteranean would be bigger than the Pacific ocean. true or false?

Hello cypic and thank you for your question.

The answer is, false, but not by much.

The combined area of the Atlantic Ocean, Indian Ocean, and
Mediterranean Sea is less than that of the Pacific Ocean.

There are various estimates for sizes of oceans, so I have listed two
separate sources to confirm my findings. One from USA TODAY and the
other from Britannica Concise Encyclopedia.

============================================

USA TODAY 

Name                  Area(Square Miles) 
Atlantic Ocean          33,420,000 
Indian Ocean            28,350,000 
Mediterranean Sea          969,100 
                Total = 62,739,100


Name                  Area(Square Miles) 

Pacific Ocean           64,186,300 

http://www.glencoe.com/sec/math/algebra/algebra1/algebra1_03/usa_today/usatoday_421_2.php4/na

===================================================

Britannica Concise Encyclopedia.

Atlantic
"the Atlantic has an area of 31,830,000 sq mi"
http://www.britannica.com/ebc/article?tocId=9356063&query=atlantic%20ocean&ct=

Indian
"With an area of 28,360,000 sq mi" 
http://www.britannica.com/ebc/article?tocId=9367902&query=indian%20ocean&ct=

Mediterranean 
"an area of about 970,000 sq mi" 
http://www.britannica.com/ebc/article?tocId=9371749&query=Mediterranean%20Sea&ct=

Total = 61,160,000

Pacific
"is approximately 63,800,000 sq mi" 
http://www.britannica.com/ebc/article?tocId=9374340&query=pacific%20ocean&ct=

Thank you for your question, and if you need any clarification of my
answer, do not hesitate to ask before rating my answer.

Very best regards.

THX1138

Search strategy included:
Mediterranean indian pacific "square miles"
://www.google.com.sv/search?hl=es&q=+Mediterranean+indian+pacific+%22square+miles%22&lr=