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Khi John lấy 5 quả bóng, kết quả có thể là 3 xanh và 2 đen. Chưa được 4 quả cùng màu.
Trong 3 loại đỏ, trắng, vàng còn lại, John phải lấy thêm ít nhất 10 quả nữa để chắc chắn có 4 quả cùng màu vì: 10 chia 3 bằng 3 dư 1. 4 quả ấy bao gồm 3 quả là Thương cộng 1 quả là Dư.
Vậy John phải lấy ít nhất 15 quả bóng để chắc chắn có 4 quả cùng màu.
The number of ways is : \(\frac{9\cdot8\cdot7\cdot6\cdot5}{120}=126\) ( ways )
Ans:126 ways
The number of balls to get off to a 3 color is:
3 + 3 + 1 = 7 (balls)
Answer: 7 balls
Có một số quả bóng trong túi. Phần còn lại là 1 khi nhóm 3 quả bóng được lấy ra. Phần còn lại là 2 khi các nhóm 5 hoặc 7 quả bóng bị loại bỏ. Số lượng quả bóng nhỏ nhất có thể có trong túi là bao nhiêu?
Fill in the gap with one suitable words
Enrico Rastelli
Enrico Rastelli was probably the greatest juggler the world has ever known. Juggling involves throwing(1)....a.....number of objects up into the air and catching them (2).....without......dropping a single one. Rastelli was able to juggle(3)....as.....many as eight balls at the same time. However,(4)....what......made him a genius was his perfect style, rather(5).......than......the quantity of objects he(6)...could.....juggle.
Rastelli's contributions to juggling were many. He started using rubber balls(7)...instead....of the cotton balls that were(8)......in...use at the time.These rubber balls are now standard. It was Rastelli,too, who began the now commonly seen practice(9).....of.....throwing a ball into the air,and then catching(10)........it....on a stick held in his mouth.
Enrico Rastelli was born into a circus family in Siberia in 1896. Although he spent some of his early years in Italy, it(11)......was.......in Russia that he acquired his juggling skills. It was not uncommon(12).....for...him to practise twelve hours a day, and this dedication was reflected in his astonishing performances. The degree of control shown(13)....by......Enrico Rastelli has never been equalled.
1. and
2. was
3. had
4. without
5. most
6. on
7. of
8. having
9. as
10.the
COMPLETE THE STORY WITH ONE WORD IN EACH GAP.
HAVE YOU EVER HAD A REALLY BORING?
When I was a student I did lots of different jobs during the summer vacation, ranging (1)...and... picking fruit to working for a furniture removal company. Fruit picking is hard work, but at least you are outside and have the copany of other pickers. Probably the least pleasant job I had (2)..was..... working in the fridge of a butcher's shop where I (3).....had....... to sort pieces of chickens. But (4).......without...... a doubt, the prize for the (5)....most........ boring job has to go to the one I had working for a sports equipment company. My task was to put six table tennis balls into boxes. They left me in a room (6)....on..... my own with a huge container of thousands of balls. I was stuck out (7)...of....... sight at the back of the storeroom without even (8)....having.... radio for company. A day in the room felt (9)...as..... a month. There is one funny thing I remember: there were supposed to be two speeds of ball: one fast and one that was slower for (10)...the....... experienced players. The things was, they were actually the same ball, they just went into different boxes!
AI GIỎI ANH GIÚP MÌNH VỚI Ạ!!!!!!!! MÌNH CẦN GẤP LẮM!!! CẢM ƠN RẤT NHIỀU Ạ!!!!
I feel you should answer yourself