Question

How many terms of ap 9 17 25 must be give a sum of 636

Answer 1

Here,a=9 d=17-9=8 and Sn=636 n=?

Sn=n/2[2a+(n-1)d]=636

n/2[2(9)+(n-1)8]=636

n/2(18+8n-8)=636

n(8n+10)=1272

8n^2+10n=1272

8n^2+10n-1272=0.

Please refer to the attachment for further steps..

Hope it helps!!

If you found it helpful..Please mark as brainliest..

Answer 2

Answer:

HEY MATE..

PLZ REFER TO THE ATTACHMENT FOR UR ANSWER

HOPE IT HELPS YOU......❤️❤️❤️