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The ratio of the 11th term to the 18th term of an AP is 2 : 3 . Find the ratio of the 5th term to the 21st term and also the ratio of the sum of the first five terms to the sum of the first 21 terms.

In a GP the 3rd term is 24 and the 6th term is 192. Find the 10th term.

In a GP the 3rd term is 24 and the 6th term is 192. Find the 10th term.

The sum of the first six terms of an arithmetic progression is 42. The ratio of the 10th term to the 30th term of the A.P. is (1)/(3) Calculate the first term and the 13th term.

The 12th term in the expansion of e^(-3) is

The sum of first 6 terms of an arithmetic progression is 42. The ratio of its 10th term to its 30th term is 1:3 . Calculate the first and 13th term of an AP.

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The fourth term of an A.P is zero. Prove that the 25th term is triple its 11th term

Find the A.P. whose 6th term =5 and 10th term=9

The sum of the 4th term and the 8th term of an A.P is 24 and the sum of the 6th term and the 10th term is 44. Find the first three terms of the A.P.