Find the first term of an AP whose 8th and 12th terms are respectively 39 and 59.
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If Sn denote the sum of the first n terms of an A.P. If S2n = 3Sn , then S3n : Sn is equal to
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If a + 1, 2a + 1, 4a  1 are in A.P., then the value of a is:
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A piece of equipment cost a certain factory 6,00,000. If it depreciates in value, 15% the first year, 13.5% the next year, 12% the third year, and so on, what will be its value at the end of 10 years, all percentages applying to the original cost?
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The 2^{nd} and 8^{th} term of an arithmetic progression are 17 and 1 respectively. What is the 14^{th} term?
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What is the sum of the first 11 terms of an arithmetic progression if the 3rd term is 1 and the 8th term is 19?
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Two A.P.’s have the same common difference. The first term of one of these is 8 and that of the other is 3. The difference between their 30th terms is
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Find the 15th term of the sequence 20, 15, 10 . . . . .
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The first term of an Arithmetic Progression is 22 and the last term is 11. If the sum is 66, the number of terms in the sequence are:
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For an A.P. if a25  a20 = 45, then d equals to:
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Consider an infinite G.P. with first term a and common ratio r, its sum is 4 and the second term is 3/4, then
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