posted by Francesca on .
Can someone help? Very confused. . .
John Sununus was once the governor of New Hampshire, and his name reminds one of the authors of a palindrome (a words which is spelt the same way forwards as backwards, such as SUNUNUS).
How many seven-letter palindromes (not necessarily real words) begin with the letter S and contain at most three letter?
Thanks for any helpful replies!