Question

                          (1 – 1/2) (1 – 1/3 ) (1 – 1/4)  (1 – 1/5)  (1 – 1/6).

 

Answer 1

\(\left(1-\dfrac{1}{2}\right)\left(1-\dfrac{1}{3}\right)\left(1-\dfrac{1}{4}\right)\left(1-\dfrac{1}{5}\right)\left(1-\dfrac{1}{6}\right)\\ =\dfrac{1}{2}.\dfrac{2}{3}.\dfrac{3}{4}.\dfrac{4}{5}.\dfrac{5}{6}\\ =\dfrac{1}{6}\)

Answer 2

\(=\dfrac{1}{2}\cdot\dfrac{2}{3}\cdot\dfrac{3}{4}\cdot\dfrac{4}{5}\cdot\dfrac{5}{6}=\dfrac{1}{6}\)

Answer 3

(1 - 1/2) x (1 - 1/3) x (1 - 1/4) x (1 - 1/5) x (1 - 1/6)

= 1/2 x 2/3 x3/4 x 4/5 x 5/6

= 1/6 (Dùng phương pháp loại trừ)

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