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Kelas 7 MatematikaBab Himpunan
Semua pedagang = s
Menjual sayuran = a
Menjual buah = b
n(s) = n(a) + n(b) - n(a∩b) + n(a∪b)'
40 = 26 + 22 - 15 + n(a∪b)'
n(a∪b)' = 40 - 33
n(a∪b)' = 7 pedagang