If a + 1, 2a + 1, 4a  1 are in A.P., then the value of a is:
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How many terms are there in 20, 25, 30 . . . . . . 140?
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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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If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
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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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The 7th and 21st terms of an AP are 6 and 22 respectively. Find the 26th term
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If three numbers be in G.P., then their logarithms will be in
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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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If the sum of the series 2 + 5 + 8 + 11 … is 60100, then the number of terms are
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15th term of A.P., x  7, x  2, x + 3, ........ is
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If the fifth term of a GP is 81 and first term is 16, what will be the 4th term of the GP?
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