mik tổ chức 1 cuộc thi vẽ nezuko
có ai tham gia ko
K
Khách
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24 tháng 12 2017
One such that I would like to talk about was the Cycling competition in high school
two years ago. One day I noticed an advertisement in our local newspaper that cycling competiton by the school on next week. I had a passion for cycling and that’s why I to participate it.
On the day of the contest, I went to the starting point and registered my name in the competition. I noticed there were around 30 competitors and I was asked to stand at my start point. With the sound of the whistle, I start cycling. The total distance was around 1 kilometers. After I finished the racing, I was really surprised to hear that I won the third prize. Some of my classmates were shouting because I was one of the three prize winners.I really happy and proud that I did well in this competition.
Chúc Bạn May Mắn Nhan !!!
DT
8
tham gia nhé
14 tháng 10 2021
Cả 3 lớp có số ngưới tham gia là:
20+30+40=90 (bạn)
Đáp số:90 bạn
^^HT^^
NV
Nguyễn Việt Lâm
Giáo viên
27 tháng 12 2020
Không gian mẫu: \(C_{30}^{10}\)
Số cách chọn sao cho 10 học sinh chỉ ở 2 tổ: \(C_{13}^{10}+C_{14}^{10}+C_{15}^{10}+C_{15}^{10}+C_{16}^{10}+C_{17}^{10}\)
Xác suất: \(P=1-\dfrac{C_{13}^{10}+C_{14}^{10}+C_{15}^{10}+C_{15}^{10}+C_{16}^{10}+C_{17}^{10}}{C_{30}^{10}}=...\)
vẽ khó lắm mk chỉ cop mạng đc thôi