B) 1-(1/2) × 1-(1/3) × 1-(1/4) × 1-(1/5) Cảm ơn mọi ngừi giúp mik nha 24/11/2021 Bởi Hadley B) 1-(1/2) × 1-(1/3) × 1-(1/4) × 1-(1/5) Cảm ơn mọi ngừi giúp mik nha
$B = (1-\dfrac{1}{2})×(1-\dfrac{1}{3})×(1-\dfrac{1}{4})×(1-\dfrac{1}{5})$ $ = \dfrac{1}{2}×\dfrac{2}{3}×\dfrac{3}{4}×\dfrac{4}{5}$ $ = \dfrac{1×2×3×4}{2×3×4×5}$ $ = \dfrac{1}{5}$ Vậy $B = \dfrac{1}{5}$ Bình luận
Đáp án: B) 1-(1/2) × 1-(1/3) × 1-(1/4) × 1-(1/5) =1x{-1/2-(-1/3)-(-1/4)-(1/5)] =1×9/20 =9/20 Bình luận
$B = (1-\dfrac{1}{2})×(1-\dfrac{1}{3})×(1-\dfrac{1}{4})×(1-\dfrac{1}{5})$
$ = \dfrac{1}{2}×\dfrac{2}{3}×\dfrac{3}{4}×\dfrac{4}{5}$
$ = \dfrac{1×2×3×4}{2×3×4×5}$
$ = \dfrac{1}{5}$
Vậy $B = \dfrac{1}{5}$
Đáp án:
B) 1-(1/2) × 1-(1/3) × 1-(1/4) × 1-(1/5)
=1x{-1/2-(-1/3)-(-1/4)-(1/5)]
=1×9/20
=9/20