Q. What is the next number of the following sequence
40, 39, 37, 33, 26, 15, ?

• ans -1
  
  40 39 37 33 26 15 (1)
  -1 -2 -4 -7 -11 (2)
  -1 -2 -3 -4 (3)
  so next(3) -5
  so next(2)-11-=-16
  so next(1)15-16=-1
  so answer -1
• 11 years agoHelpfull: Yes(20) No(4)
• 40, 39, 37, 33, 26, 15,
  first diff : 1 , 2 , 4 , 7 , 11
  second diff : 1 , 2 , 3 , 4 , 5
  so next second diff will be 6
  so next first diff will be 16
  so next number will be 15-16 = -1
• 11 years agoHelpfull: Yes(15) No(0)
• 40-(1)=39
  39-(1+1)=37
  37-(1+1+2)=33
  33-(1+1+2+3)=26
  26-(1+1+2+3+4)=15
  15-(1+1+2+3+4+5)=-1
• 11 years agoHelpfull: Yes(6) No(0)
• in this qstn difference is
  40-39=1
  39-37=2
  37-33=4
  33-26=7
  26-15=11
  here difference is in order 1,2,3,4 so next is 5
  so 15-(-1)=16
  so ans is -1
  
• 11 years agoHelpfull: Yes(4) No(0)
• -1 ans
  40-1=39
  39-2=37
  37-4=33
  33-7=26
  26-11=15
  15-16=-1
• 11 years agoHelpfull: Yes(3) No(0)
• answer is 4. difference between two numbers increase in each step by odd values, 1, 3, 5, 7, 9, and finally 15-11=4
• 11 years agoHelpfull: Yes(0) No(30)
• 40 0 numbers 39
  39 1 number 37
  37 3 numbers 33
  33 7 numbers 26
  26 11 numbers 15
  15 17 numbers 32
• 7 years agoHelpfull: Yes(0) No(0)