how many alphabets be arranged so that there are 7 letters between a and b

• A-------B or B-------A => 2 WAYS
  from rest 24 letters, 7 can be arranged in 24P7 = 24! ways
  also position of A-------B can be 1-------9, 2--------10, ..., 18-------26 => 18 ways
  total no. of ways = 24P7 * 2 * 18
• 9 years agoHelpfull: Yes(3) No(7)