Q. 2 E4.3( 27 Votes )

# Which term of the A.P. is its first negative term?

a = 121, d = -4

An = -ve

An= a + (n – 1) d

= 121 + (n – 1) -4

= 125 – 4n

Since, we want –ve term

Therefore, 4n should be a number greater than 125

Hence, 128 is the number greater than 125 and divisible by 4

4n = 128

n = 32

Therefore, 32nd term of the given A.P. is –ve

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos  Champ Quiz | Arithmetic Progression34 mins  Champ Quiz | Arithmetic Progression30 mins  Quiz | Arithmetic Progression44 mins  NCERT | Fundamental Theorem Of Arithmetic45 mins  Quiz on Arithmetic Progression Quiz32 mins  NCERT | Arithmetic Progression36 mins  Get to Know About Geometric Progression41 mins  NCERT | Solving Questions on Introduction of A.P42 mins  Arithmetic progression: Previous Year NTSE Questions34 mins  NCERT | Questions on General Term of an A.P47 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation view all courses 