If the first term of an A.P is 40 and the sum of the fist seven terms is equal to one-fourth of the sum of the next three terms,then which term is the first negative term of the progreesion?

1) 5th
2) 3rd
3) 8th
4) 4th

• 4 th term
  
  (7/2)*(80+6d)= 0.25 *(120+24d)
  d=-50/3
  
  so 4 th term is first -ve term.
• 12 years agoHelpfull: Yes(0) No(0)