7,-14,-4,15,-30,-20,-21

• 7*(-2)=-14
  -14+10=-4
  Again 15*(-2)=-30
  -30+10=-20
  in the same way -21*(-2)=42
  and 42+10=52
  hence the series is 7,-14,-4,15,-30,-20,-21,42,52
• 12 years agoHelpfull: Yes(86) No(1)
• Ans: 42
  solved above
  
• 12 years agoHelpfull: Yes(14) No(3)
• 3,2,1,4,5,4,5,1,0,6,3
  1st series is 3,_,_, 4,_,_ ,5,_,_ ,6,_,_,3,_ ,_,7
  subtracting the middle terms ans should be 1
  2-1=1
  5-4=1
  1-0=1
  3-2=1
  so the next number should be 2
  
• 11 years agoHelpfull: Yes(1) No(13)
• 7*(-2) = -14 diff(-14,-4)------>10
  15*(-2) = -10 diff(-30,-20)----->10 in the same way
  -21*(-2) = 42
  
  ans:42
  
  
• 10 years agoHelpfull: Yes(1) No(2)
• ans: 42
  sol:
  7*-2=-14, -14+10=-4
  15*-2=-30, -30+10=-20
  -21*-2=42, 42+10=52
• 7 years agoHelpfull: Yes(1) No(0)
• 23 because 15 will follow same as 7 and will be 15+8
• 5 years agoHelpfull: Yes(0) No(0)