## Question

###### 1-a) In how many permutations of the 26 letters in the alphabet. do the patterns ads dog and sol not appear? b) In how many ofthe permutations of {1,2._ 10} exactly 3 of the even numbers and one of the odd numbers are in the correct position?

1-a) In how many permutations of the 26 letters in the alphabet. do the patterns ads dog and sol not appear? b) In how many ofthe permutations of {1,2._ 10} exactly 3 of the even numbers and one of the odd numbers are in the correct position?

## Answers

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