Q. What is the next number of the following sequence
7,-14,-4,15,-30,-20,-21,....?

• it follows the series as x,x*-2,(x*-2)+10 and repeats again...
  
  7, 7*-2, (7*-2)+10, 15,15*-2,(15*-2)+10, -21, (-21*-2)=42, (-21*-2)+10=52...
  
  
• 11 years agoHelpfull: Yes(16) No(0)
• skip the terms -4 and -20.observe 7*-2=-14,15*-2=-30,so next 21*-2=+42.
• 11 years agoHelpfull: Yes(4) No(2)
• ans is 42 7*(-2)=-14 leave 1 term n den go on..
• 11 years agoHelpfull: Yes(1) No(2)
• ans is 42 .
  
• 11 years agoHelpfull: Yes(1) No(1)