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2013 PMWC Problems/Problem I1

Revision as of 12:02, 19 November 2015 by Ihightower (talk | contribs) (answer for q1)
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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.

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