Question

Consider an arithmetic sequence whose sum of 1st 9 terms is 261 and sum of next 6 is 444. Find the 1st term and common difference?

Answer 1

Step-by-step explanation:

n/2(2a+(n-1)d)=sn=261. sn=444.9/2(2a+8d)=261 .15/2(2a+14d)=705. 58=2a+8d. 94=2a+14d. -6a=-36 then a=6 12+8d=261 d=32