Three Dice Trick

Ben Sparks with another trick - can you guess how it works before he explains it?

This is the second of a trilogy of dice tricks with Ben Sparks... More to come...

Martin Gardner called this trick "Guessing The Total".

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Ben Sparks: https://www.bensparks.co.uk

More Ben Sparks on Numberphile: http://bit.ly/Sparks_Playlist