Solution 1:
Order matters since sequence 0,1,2,3,4 is different from 1,0,2,3,4
Repetition is allowed since we are not given explicitly that repetition is not allowed
a) No. of sequences = 16^5
b) No. of sequence = p(16,6) = 16!/10!= 16x14x15x14x13x12x11
c) No. of sequence = total sequence - (no. of sequence having all numbers - no. of sequence having all letters)
= 16^5 - 10^5 -6^5
Solution 2 should be readable
Please let me know which one is correct or how it should be answered where wrong.
Thanks