Question 470657
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Hi,
Forty Students in ALL. 40-6(attended neither) = 34 attended one or the other or both recital(s)
 20  + 23 = 43 in attendance.   43-34 = 9 attended both.

Checking our Answer
 only one  =  25   (11 + 14)
      both =   9
      none  =  6