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Suppose A(1) ,A(2) ,. . . .,A(30) are ...

Suppose `A_(1) ,A_(2) ,. . . .,A_(30) ` are thirty sets each with fvie elements and `B_(1),B_(2), .. . .,B_(n)` are n sets elements such that `bigcup_(i=1)^(30)A_(i)= bigcup _(i=1)^(n)B_(i)` and exactly 9 of the `B_(j)`'s then the value of n , is

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