Find an A.P. whose fourth term is 9 and ...

Find an A.P. whose fourth term is 9 and the sum of its sixth term and thirteenth term is 40.

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Find an AP whose 4th term is 9 and the sum of its 6th and 13th terms is 40.

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Determine the AP whose fifth term is 19 and the difference of the eighth term from the thirteenth term is 20.

The seventh term of an AP,whose fourth term is 12 more than its first term and sum of its third and fourth term is 5 more than 3 xx its first term,is

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In an A.P., the first term is 2 and the sum of the first five terms is one-fourth of the next five terms. Show that 20th term is -112.

Find the sum of 'n' terms of an A.P. whose nth term is 2n+1.

In an A.P.,the first term is 2 and the sum of the first five terms is one-fourth of the next five terms.Show that 20 th term is -112

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