Answer:
a= 8 ways
b. 20
Step-by-step explanation:
Palindrome of length 6 means first three digits must be same as the last three in reverse. For example 123321 is palindrome of six digits.
There 2 bits 0 and 1
a.So each of first three digits can be filled in 2 ways
therefore, 2*2*2= 8 ways
number of different palindromes of 6 digits will be 8
b. In a 6 digit a palindrome there Are 6 spaces in which 3 spaces are to be filled with 1's
this cab be done in
[tex]_{6}^{3}\textrm{C}= \frac{6!}{3!\times3!}[/tex]
= 20
