Each of the digits in the number 63458791 is arranged in descending order from left to right. The position(s) of how many digits will remain unchanged in the new number thus formed as compared to the original number?

Refer to the given series and answer the question that follows (counting to be done from left to right only): (Left) 6 6 8 6 7 4 5 9 9 1 7 6 8 1 4 5 4 7 1 4 1 1 4 3 5 4 3 (Right) How many such even numbers are there, each of which is immediately preceded by an odd number and also immediately followed by an even number?

Refer to the following series and answer the question (counting to be done from left to right only): (Left) 3 7 9 8 5 3 6 2 2 1 5 3 7 1 5 7 5 7 1 8 4 3 6 9 7 4 4 (Right) How many such odd digits are there, each of which is immediately preceded by an odd digit and also immediately followed by an odd digit?