Question

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Answer 1

№268
А₂₁³ = 21!/18! = 19*20*21=3990
Р₅ = 5! = 1*2*3*4*5=120
С₁₂⁵ = 12!/(5!*7!)=792
С₁₂⁷ = 12!/(7!*5!) = 792
№269
С₁₀⁴ = 10!/(4!*6!) = 210
С₁₀⁶ = 10!/(6!*4!) =210