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4.33
skor = benar x 4 + salah x -2 + kosong x 0
= 36 x 4 + 8x (-2) + 6 x 0
= 144 - 16 + 0
= 128
4.Banyak siswa yang memilih kegiatan lain = 150 - (105+82-70)
= 150 - 117
= 33 siswa