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1 2
1 3
1 4
2 3
2 4
3 4
kejadian dua-duanya ganjil = 1
semua kejadian = 6
peluang = 1/6
=========
atau gunakan kombinasi :
jumlah bola bernomor ganjil = 2
jumlah seluruh bola = 4
jumlah bola yang diambil sekaligus = 2
peluang = 2C2 / 4C2
= (2!/(2-2)!2!) / (4!/(4-2)!2!)
= (2!/0!2!) / (4!/2!2!)
= 2! / (4!/2!)
= 2!2! / 4!
= 2x2 / 4x3!
= 1/3!
= 1/(3x2x1)
= 1/6