If 4 times the 4th term of an ap is equal to 18 times its 16 term
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a4 = a + 3d
a16 = a + 15d
4 ( a + 3d ) = 18 ( a + 15d )
4a + 12d = 18a + 270d
4a - 18a = 270d - 12d
- 14a = 258d
- 7a = 129d
a/d = - 129/7
a16 = a + 15d
4 ( a + 3d ) = 18 ( a + 15d )
4a + 12d = 18a + 270d
4a - 18a = 270d - 12d
- 14a = 258d
- 7a = 129d
a/d = - 129/7
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