Question

8 term of an AP is 0 prove that 38th term is triple of its 18th term
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Answer 1

Answer:

A +7d= 0

a= -7d

as its the 38th term

a₃₈ = a +37d

= -7d + 37d

= 30d

for the 18th term

a₁₈= a +17d

= -7d + 17d

= 10d

so a₃₈ = 3a₁₈