
Each of the digits and is written on a separate card. The six cards are then laid out in a row to form a digit number.
How many distinct digit numbers are there?


Important Questions on Combinatorics and Mathematical Induction
Each of the digits and is written on a separate card. The six cards are then laid out in a row to form a digit number.
How many of these digit numbers are even?

Each of the digits and is written on a separate card. The six cards are then laid out in a row to form a digit number.
How many of these digit numbers are divisible by

If the letters of the word GARDEN are permuted in all possible ways and the strings thus formed are arranged in the dictionary order, then find the rank of the word GARDEN?

If the letters of the word GARDEN are permuted in all possible ways and the strings thus formed are arranged in the dictionary order, then find the rank of the word DANGER.




