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The question is ambiguous:

  • If each girl shakes one other person's hand once, then there are seven (7) handshakes.
  • If each girl shakes each other girl's hand once, then there are 7 x 6 x 0.5 = 21 handshakes (each girl x each other girl x cancelling out the doubles).

Another way to look at this one:

  • If each girl shakes each of the other girl's hand once, there would be 42 shakes (each girl shakes 6 hands, times 7 girls, an assupmtion is made that each girl is not shaking her own hands, you can't tell much from the question so assuming ensues)
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15y ago

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Q: If 7 girls shake hands only once how many handshakes does that make?
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