if7 times the 7th terms ofan arithmetic progression is equal to 11 time is 11th terms, show that its
18th term is 0 can you find the 1st terms andthe common difference -justify your answer
7(a+6d) = 11(a+10d)
7a + 42d = 11a + 110d
-4a = 68d
a = -17d
term18 = a + 17d
= -17d + 17d = 0