They are 3.50 each.
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Its like a Tupperware party except with purses and totes. There is a Thirty-One catalog on-line.
There were ten people at the party. This is a triangular sequence starting with two people: 1, 3, 6, 10, 15, 21, 28, 36, 45, etc. There's an equation for this. With n people at the party, the number of handshakes is n(n-1)/2.
3. AB, BC and CA.
A party. Also 48 pizzas.