Question

How many number of ways a 7 digit number can be formed from the 01 2 3 4 3 2 1 such that odd digits are always at odd places?​

Answer 1

Answer:

Almost more than 20 ways these numbers can written like-

1234321

1234123

3234121

3214123

3214321

1234301

1234103

3234101

3214103

3214301

etc........