Sriman Dutta Posted December 27, 2016 Share Posted December 27, 2016 Hello everyone, Can anyone find what is the digit at the unit's place of the product 81x82x83x....x89, without actual multiplication? Link to comment Share on other sites More sharing options...
imatfaal Posted December 27, 2016 Share Posted December 27, 2016 Well there is a tiny bit of multiplication There is a "...-five times ...-two" in there so the last digit must be zero Link to comment Share on other sites More sharing options...
Sriman Dutta Posted December 27, 2016 Author Share Posted December 27, 2016 Correct. Link to comment Share on other sites More sharing options...
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