If a + 1, 2a + 1, 4a - 1 are in A.P., then the value of a is:
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1
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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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2
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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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3
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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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4
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In an A.P., if d = -4, n = 7, an = 4, then a is
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5
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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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6
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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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7
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If S1 is the sum of an arithmetic progression of ‘n’ odd number of terms and S2 is the sum of the terms of the series in odd places, then \(\frac{{{S_1}}}{{{S_2}}}\)
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8
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The sum of first five multiples of 3 is:
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9
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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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10
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The 3rd and 8th term of an arithmetic progression are -13 and 2 respectively. What is the 14th term?
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