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if A =( 5, 7,8,9 ), B = ( 3, 4,5,6 ) and...

if `A =( 5, 7,8,9 ), B = ( 3, 4,5,6 )` and `C = ( 2, 4,6,8 10)` where n is total number of distinct elements in a set . find `n (A) +n (B)​`

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