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by zmgsabst
11 hours ago
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You can take the two variables to be outcomes of a binomial event: - at zero events: we have one outcome, nothing - at one event: we have two outcomes, 1X and 1Y - at two events, each of those two outcomes have two outcomes, but one X and one Y outcome both become XY, so we have 1X^2 2XY 1Y^2. You can continue combining this way, adding an X and Y to each term (for the two possible outcomes) — and then grouping like terms. |
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