Suppose that s1, s2, s3 form a partition of the universal set s. let a be an arbitrary set. assume that we know |a∩s1|=n1 |a∩s2|=n2 |a∩s3|=n3 find |a|.

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the answer is 13

step-by-step explanation:

5*5=25

12*12=144

25+144=169

169^2=13

step-by-step explanation: