If s1,s2,s3 be the sum of n, 2n, 3n terms respectively of an a.p. prove that s3=3(s2-s1).

If s1,s2,s3 be the sum of n, 2n, 3n terms respectively of an a.p. prov

1.	If s1,s2,s3 be the sum of n, 2n, 3n terms respectively of an a.p. prove that s3=3(s2-s1).
Answer» द मीनिंग ऑफ द इज द स्पीड ऑफ नॉलेज एंड प्रिवेंशन ऑफ See Page no 542.Q.no .17 of RS Agrawal.