Because (Y<μ)∩(Y<17)=(Y<μ) as the set (Y<μ) is contained ENTIRELY in the set (Y<17). So the intersection between the two sets is simply the smaller set.
Because (Y<μ)∩(Y<17)=(Y<μ) as the set (Y<μ) is contained ENTIRELY in the set (Y<17). So the intersection between the two sets is simply the smaller set.
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