A1, a2, a3 form a partition of the universal set s

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Suppoe that A1, A2, A3 form a partition of the universal set S. Let B be an arbitrary set. Assume that we know

|B∩A1|=10,

|B∩A2|=20,

|B∩A3|=15.

Find|B|.

Reference no: EM13945164

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