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Misalkan
A= 1 +p dan B = 1 -p
AB = (1 +p)(1 -p) = 1² -p² = 1 - p²
sehingga soal kamu dapat saya tulis
1/(A^5) × B^7 × A^6
= (A^6)/(A^5) × B^7
= A^(6-5) × B^7
= A^1 × B^7
= AB^7
Subtitusikan kembali ke asalnya
= (1 +p)(1-p)^7
Sayang , tak ada pilihan !