# Day 12: Picking a Christmas Card

Rachel has found that her class' Christmas cards have all been mixed up in a pile. There are 33 cards in the pile, and she knows that there are $$n$$ cards that are addressed to her.

She picks two cards at random (without replacement). The probability that both cards are addressed to her is $$\frac18$$.

Find the value of $$n$$.

###### This problem is part of the Advent Calendar 2015.
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