How many terms are there in 20, 25, 30 . . . . . . 140?
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If the sum of three consecutive terms of an increasing A.P. is 51 and the product of the first and third of these terms is 273, then the third term is :
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2
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If log 2, log (2^{x} 1) and log (2^{x} + 3) are in A.P, then x is equal to ___
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3
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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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4
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If the sum of p terms of an A.P. is q and the sum of q terms is p, then the sum of (p + q) terms will be
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5
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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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6
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The first and last term of an A.P. is a and l respectively. If S is the sum of all the terms of the A.P. and the common difference is given by \(\frac{{{l^2}  {a^2}}}{{k  \left( {l + a} \right)}}\) then k = ?
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7
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Find the n^{th} term of the following sequence :
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8
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The 3rd and 6th term of an arithmetic progression are 13 and 5 respectively. What is the 11th term?
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9
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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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10
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If the sum of n terms of an A.P. be 3n2 + n and its common difference is 6, then its first term is
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