28 students are badminton club members only.
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2 students are in computer club only.
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12 students are in both badminton and computer club.
; X2 j& c0 [$ u9 I+ `公仔箱論壇
: l3 S3 Y ]. c% i7 V) [tvb now,tvbnow,bttvbtherefore 28+2+12+6=48 |