If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
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In an A.P., if d = -4, n = 7, an = 4, then a is
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If a, b, c are in A.P., then (a – c)2/ (b2 – ac) =
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3
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15th term of A.P., x - 7, x - 2, x + 3, ........ is
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4
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What is the sum of all 3 digit numbers that leave a remainder of '2' when divided by 3?
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5
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If 18, a, b - 3 are in A.P. then a + b =
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6
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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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7
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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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8
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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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The nth term of an A.P., the sum of whose n terms is Sn, is
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10
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The common difference of the A.P. \(\frac{1}{3}, \frac{{1 - 3b}}{3} , \frac{{1 - 6b}}{3}\) . . . . . . is
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