Que: The code for a safe is of the form PPPQQQQ where P is any number from 0 to 9 and Q represents the letters of the alphabet. How many codes are possible for each of the following cases? Note that the digits and letters of the alphabet can be repeated.

a. 874261140
b. 537856330
c. 549872700
d. 456976000
Answer: 456976000

Leave a Comment