if 9th term of ap is 0 .prove that its 29th term is double of its 19th term (solve it without cheating )
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Hello !!
9th term = 0
a + 8d = 0
a = -8d
To prove :
29th term = 2 ( 19th term )
a + 28d = 2 ( a + 18d )
-8d + 28d = 2 ( -8d + 18d )
20d = 2 ( 10d )
20d = 20d....... PROVED.......
Hence,
29th term of an ap is equal to double of it's 19th term .
9th term = 0
a + 8d = 0
a = -8d
To prove :
29th term = 2 ( 19th term )
a + 28d = 2 ( a + 18d )
-8d + 28d = 2 ( -8d + 18d )
20d = 2 ( 10d )
20d = 20d....... PROVED.......
Hence,
29th term of an ap is equal to double of it's 19th term .
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