1 weight 6 ping pongs with another 6 ping pongs. see which side is heavier
$ Q6 s" r; a7 o; M- `: J9 ^2 i7 \tvb now,tvbnow,bttvb2 spilt the heavier side ping pongs in half and weight against each othertvb now,tvbnow,bttvb% x7 o1 ~9 T6 Z: K |( c$ e
3 weiht either ping pongs one on one then you will know which is the heavy one. |