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Given,

 a+8d=0

19th term of ap= a+18d

  =(a+8d)+10d

  = (0)+10d

  = 10d  .................(1)

29th term = a+28d

  =(a+8d)+20d

  = (0)+20d

  =20d ..............(.2)

From (1) & (2), it can be obsrevd that 29th term is double the 19th term.

Hope it helps..

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