cho mik tham gia nhóm nhé

ukm

ukm

-.- cj ơi đừng viết giống em được ko

ukm

thi gì ?

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 !!!

thi đầu, like cái ủng hộ mk nha!

có đó

vào ioe mà thi

ioe

vào ioe mà thi

tham gia nhé

Tớ nghĩ là chưa đâu.

Cả 3 lớp có số ngưới tham gia là:

20+30+40=90 (bạn)

Đáp số:90 bạn

^^HT^^

có tất cả 90 bạn tham gia

Cả 3 lớp có tất cả số bạn tham gia là:

  20+30+40=90(bạn)

   Đáp số:90 bạn

k cho mk nha ban

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: \(P=1-\dfrac{C_{13}^{10}+C_{14}^{10}+C_{15}^{10}+C_{15}^{10}+C_{16}^{10}+C_{17}^{10}}{C_{30}^{10}}=...\)