If 18, a, b  3 are in A.P. then a + b =
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Let S denotes the sum of n terms of an A.P. whose first term is a. If the common difference d is given by d = S_{n} – k S_{n1} + S_{n2} then k =
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2
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What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?
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3
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If the sum of n terms of an A.P. is 3n2 + 5n then which of its terms is 164 ?
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4
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The sum of first n odd natural numbers in
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5
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In an A.P., if d = 4, n = 7, an = 4, then a is
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6
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The 2^{nd} and 6^{th} term of an arithmetic progression are 8 and 20 respectively. What is the 20^{th} term?
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7
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If k, 2k – 1 and 2k + 1 are three consecutive terms of an AP, the value of k is
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8
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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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9
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The 3rd and 9th term of an arithmetic progression are 8 and 10 respectively. What is the 16th term?
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10
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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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