Difference between revisions of "2013 PMWC Problems/Problem I1"
Ihightower (talk | contribs) (answer for q1) |
(No difference)
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Latest revision as of 13:02, 19 November 2015
I think it should be 5.
sum of 1 to 9.. is 9x10/2 =45
total cards with them.. is 40
so 5 is the left out one.
