a. x =125
( 125 - 1 ) · ( 125 -2 ) ·········· ( 125 - 125 ) ····· ( 125 - 2010 ) = 0
un termen al produsului ↓ = 0
P ₀ = ( -1) · ( -2) · ( -3) ········· ( - 2010 ) = suma de 2010 termeni , factor ( -1) de 2010 ori
= ( -1) ²⁰¹⁰ · 1·2·3··········· 2010 = 1·2·3········ 2010
P ₂₀₁₁ = 2010 · 2009 · ······· 3 · 2 · 1
⇒ P ₀ = P ₂₀₁₁