What should come in place of the question mark (?) in the following series?
N5V, K7T, ? , E14P, B19N
Option
(a) I10R
(b) H10Q
(c) H9R
(d) H10R

• N5V, K7T, ? , E14P, B19N
  
  N,K,H,E,B (-3) of previous
  5,7,10,14,19 increasing series by +2,+3,+4,+5
  V,T,R,P,N (-2) of previous
  
  so, ? = H10R
  (d) H10R
  
• 10 years agoHelpfull: Yes(3) No(0)
• Q: N5V, K7T, ? , E14P, B19N
  
  1 step: N,K,H,E,B (-3) of previous
  2 step: 5,7,10,14,19 increasing series by +2,+3,+4,+5
  3 step: V,T,R,P,N (-2) of previous
  
  so,
  ? = H10R
  (d) H10R
• 6 years agoHelpfull: Yes(0) No(0)
• option (d) H10R
• 5 years agoHelpfull: Yes(0) No(0)