If 18th and 11th term of an A.P. are in the ratio 3 : 2, then its 21st and 5th terms are in the ratio
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Which term of the A.P. 92, 88, 84, 80, ...... is 0?
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2
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The sum of first n odd natural numbers in
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3
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Sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \) ....... is
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4
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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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5
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The 2nd and 8th term of an arithmetic progression are 17 and 1 respectively. What is the 14th term?
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6
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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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7
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A boy agrees to work at the rate of one rupee on the first day, two rupees on the second day, and four rupees on third day and so on. How much will the boy get if he started working on the 1st of February and finishes on the 20th of February?
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8
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If an A.P. has a = 1, tn = 20 and sn = 399, then value of n 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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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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