Question

A number is said to be a palindrome if it reads the same backwards as forwards(e.g.58485).

How many 5-digit numbers are palin-dromes?

Answer 1

2*9C2 = 2*9*8=144 ( might be so)

Answer 2

The numbers will have the following pattern:

abcba

where a, b, c are digits.
since it's a 5 digit number:
a = 1-9 (9 digits possible)
b= 0-9 (10 digits possible)
c= 0-9 (10 digits possible)

number of possibilities are 9*10*10 = 900

Answer 3

a cannot be 0 , coz then the number will have a leading 0 as a digit making it a 4 digit number.

Answer 4

thanks.