In arithmetic progression if 7 times the 7th term is equal to 11 times the 11th term.prove that 18th term is equal to zero
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So, 7(a + 6d) = 11(a + 10d)
7a + 42d = 11a + 110d
-62d = 4a
a = -17d.
Now, the 18th term = a + 17d
= -17d + 17d
= 0
Hence proved.
7a + 42d = 11a + 110d
-62d = 4a
a = -17d.
Now, the 18th term = a + 17d
= -17d + 17d
= 0
Hence proved.
shashank213:
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It's alright. I'm glad I could be of help! :)
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