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In [[statistics]], an '''exchangeable sequence of random variables''' (also sometimes '''interchangeable''')<ref name="ChowTeicher"/> is a sequence ''X''<sub>1</sub>, ''X''<sub>2</sub>, ''X''<sub>3</sub>, ... (which may be finitely or infinitely long) whose joint probability distribution does not change when the positions in the sequence in which finitely many of them appear
: <math> X_1, X_2, X_3, X_4, X_5, X_6 \quad \text{ and } \quad X_3, X_6, X_1, X_5, X_2, X_4 </math>
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