In an arithmetic progression, the seventh termis six times the third term and the sum of the first terms is 165. Find the first term, a and the common difference , d ??? anyone can help me for answer this question???

Question

anonymous · Answer

help...

anonymous · Answer

let the progression be a,a+d,a+2d.........where a=first term and d=common difference
seventh term is a+6d
third term is a+2d
from the initial part seventh term=6(third term)
a+6d=6a+12d is the equation

anonymous · Answer

the next sentence should include a number stating sum of first 3 terms or 4 terms like that

anonymous · Answer

that gives equation 2 solve both equations to get a and d

anonymous · Answer

ok... tq... i'll try to do