find number of zeroes at end of 1!*2!*3!*.........*30!

• Ans is 87 zeros
  for 5! to 9! One zero for each
  1+1+1+1+1=5
  from 10! To 14 fact two zeros
  2+2+2+2+2=10
  for 15 to 19 fact three zeros
  3+3+3+3+3=15
  from 20 fact to 24 fact 4 zeros each 4*5=20
  from 25 to 29 fact 6 zeros
  6*5=30
  for 30 fact there are 7 zeros
  so total zeros=5+10+15+20+30+7=87 zeros
• 10 years agoHelpfull: Yes(5) No(0)