Asosiy tarkibga oʻtish
C_20 ga nisbatan hosilani topish
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Baholash
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Veb-qidiruvdagi o'xshash muammolar

Baham ko'rish

20C_{20}^{1-1}
ax^{n} hosilasi – nax^{n-1}.
20C_{20}^{0}
1 dan 1 ni ayirish.
20\times 1
Har qanday t sharti uchun (0 bundan mustasno) t^{0}=1.
20
Har qanday t sharti uchun t\times 1=t va 1t=t.