what percent of 4 digit palindrome are not divisible by 77

• Ans is 20%
  There are total 90 palindromes with 4 digits
  a palindrome is divisable by 77 when the middle two number are 77 or 00
  so there are 9*2=18 numbers are like that
  hence the percentage of a palindrome disisable by 77 is 18*100/90=20%.
• 10 years agoHelpfull: Yes(1) No(0)