Complete the series
1,5,20,?

• 1*5=5
  5*4=20
  20*3=60
  hence next number should be 60.In each sucessive step the mutiplying number is decreasing by 1.
• 10 years agoHelpfull: Yes(1) No(2)
• 60
  
  1*5=5
  5*4=20
  20*3=60
  
• 10 years agoHelpfull: Yes(1) No(0)
• 1,5,20,60
  1x5=5
  5x4=20
  20x3=60
• 10 years agoHelpfull: Yes(1) No(0)
• 1*5=5
  5*4=20
  20*3=60......
• 10 years agoHelpfull: Yes(1) No(0)
• 24
  1+4=5
  5*4=20
  20+4=24
• 10 years agoHelpfull: Yes(0) No(1)
• Ans: 1,5,20,300...
  Reason : 1-5=4; so ,5*4=20 : & 20-5 = 15 , so 20*15=300
• 10 years agoHelpfull: Yes(0) No(1)
• Ans: 1,5,20,300
  diff is 1-5=4; next no=5*4=20 , 20-5 = 15 ,next no will be 20*15=300
  
• 10 years agoHelpfull: Yes(0) No(1)