Question 1011597
 
Question:
What are the combination in PAN SERIES
ABCPE1234F
Out of 10 digits, first five digits should be alphabets(26 letters in each digit), next four digits should be Numerical Value(0-9 in each digit) and the last digit should be Alphabet(26 letters)
 
Solution:
There is a total of 10 digits in each "word".

If the digits and letters are allowed to repeat, then there are
{{{n=26^6*10*4=3089157760000}}}
distinct "words".

If the digits and letters are both not allowed to repeat, then there are
{{{N=P(26,5)*P(10,5)=26!/21!*10!/5!=238702464000}}}
words with distinct letters or digits.