Please wait...
1800-212-7858 (Toll Free)
9:00am - 8:00pm IST all days
8104911739
For Business Enquiry

or

Thanks, You will receive a call shortly.
Customer Support

You are very important to us

For any content/service related issues please contact on this toll free number

022-62211530

Mon to Sat - 11 AM to 8 PM

Find the number of terms of the AP 98,91,84,.. must be taken to give a sum of zero?

Asked by Topperlearning User 4th October 2016, 6:55 AM
Answered by Expert
Answer:

a equals 98
d equals negative 7
l e t space t h e space n u m b e r space o f space t e r m s space b e space n.
s u m space o f space n space t e r m s space w i l l space b e space S subscript n equals n over 2 left parenthesis 2 a plus left parenthesis n minus 1 right parenthesis d right parenthesis
S subscript n equals n over 2 left parenthesis 196 minus 7 n plus 7 right parenthesis
A c c o r d i n g space t o space t h e space q u e s t i o n space S subscript n equals 0
n over 2 left parenthesis 203 minus 7 n right parenthesis equals 0 rightwards double arrow n equals 0 comma 29
w e space c a n space t a k e space e i t h e r space n o space t e r m s space o r space 29 space t e r m s space f o r space t h e space s u m space t o space b e space z e r o

Answered by Expert 4th October 2016, 8:55 AM
Rate this answer
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

You have rated this answer /10

Your answer has been posted successfully!

Free related questions

17th October 2016, 11:39 AM
20th October 2016, 12:56 PM
13th November 2016, 11:25 PM

Chat with us on WhatsApp