If 7 time the 7th term of an
a.p. is equals to 11 times the 11th term of the
a.p. , find its 18th term
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abrar14:
how to find the 3 equivalent fractions by division ,4/16
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given :-
7 ( a7 ) = 11 ( a11 )
7 ( a + 6d ) = 11 ( a + 10d )
7a + 42d = 11a + 110d
7a - 11a + 42d - 110d = 0
4a - 68d = 0
a - 17d = 0
a = 17d ....... ( i )
To find 18th term
a18 = a + ( n - 1 )d
a18 = a + 17d
a18 = 17d + 17d
a18 = 34d
7 ( a7 ) = 11 ( a11 )
7 ( a + 6d ) = 11 ( a + 10d )
7a + 42d = 11a + 110d
7a - 11a + 42d - 110d = 0
4a - 68d = 0
a - 17d = 0
a = 17d ....... ( i )
To find 18th term
a18 = a + ( n - 1 )d
a18 = a + 17d
a18 = 17d + 17d
a18 = 34d
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