Skip to content / Đến nội dung
ThichHocToan.com

Australian AMC 2009 - Upper Primary Question 12

AMC AUSTRALIA · Australian AMC 2009 - Upper Primary

Question 12

Ali has a bag containing 100 jelly beans. In his bag there are equal numbers of red, blue, green, yellow and brown jelly beans. If Ali closes his eyes and takes jelly beans out of the bag one by one, what is the smallest number he needs to take out to ensure he will have five of the same colour?
  1. 5
  2. 9
  3. 20
  4. 21
  5. 25