A Mystifying Mathematical Card Effect!

This trick first appeared in Card Colm: Low Down Triple Dealing.

Watch the “How To” Video:

This trick can also be found in the book, Mathematical Card Magic: Fifty-Two New Effectsby Colm Mulcahy, with a foreword by Max Maven. (A.K. Peters/CRC Press, 380 pp., 128 illustrations, August, 2013)