10,12,-36,-7,-5,15,19,21.....?

• ANS -63
  LET US SPLIT SERIES BY 10 12 -36 ,-7 -5 15, 19 21 ?
  10+2=12 -7+2=-5 19+2=21
  12*-3=-36 -5*-3=15 21*-3=-63 SERIES GOES LIKE +2 AND ANS*-3
  
• 11 years agoHelpfull: Yes(59) No(6)
• 10+2=12
  12* -3 = -36
  
  
  -7+2=5
  5*-3=15
  
  19+2=21
  21*-3=-63
• 7 years agoHelpfull: Yes(9) No(1)
• (10 12 -36) (-7 -5 15 ) (19 21 x)....
  (a1 b1 c1) (a2 b2 c2) (a3 b3 c3)
  
  see the pattern :
  a1 - a2 + 2 = a3
  b1 - b2 + 4 = b3
  
  hence
  
  c1 - c2 + 6 = c3
  
  which is : -36 - 15 + 6
  = -45
  Ans: -45
• 7 years agoHelpfull: Yes(1) No(0)
• 10+2 = 12
  12*3 =(-36)
  -7+2 = -5
  -5*3 = -(-15)=(15)
  19+2 = 21
  21*3 = -63
• 7 years agoHelpfull: Yes(1) No(0)
• 10+2=12
  12*-3=36
  
  -7-(-2)=-5
  -5*-3=15
  
  19+2=21
  21*-3=-63
• 7 years agoHelpfull: Yes(0) No(0)