what was the number of kasualtes in the 2nd world war.?

Answer 1

Between 55 million and, some, place the numbers as high as 70 million.
Check out the sources and references for details:
http://users.erols.com/mwhite28/warstat1.htm#Second
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Answer 2

The number usually kicked around is about 56 million.

Answer 3

Casualties ! As a mark of respest one should at the very least know how to spell the word. Actual figures are still unknown. Best estimate is something like 72,155,800,of which 47,000,000 were Civilian casualties.