Question 20
Nine cards are labelled $1,2,2,3,3,3,4,5,6$. Cards with odd numbers are red and the others are blue. How many arrangements in a row have the number on each red card less than or equal to the number on every red card to its right?
Practice counting convention: cards with the same number and colour are indistinguishable; arrangements are distinguished by the visible row of numbers.
Enter the number only.
Practice counting convention: cards with the same number and colour are indistinguishable; arrangements are distinguished by the visible row of numbers.
Enter the number only.