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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1
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The two geometric means between the number 1 and 64 are
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2
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In an A.P., if d = -4, n = 7, an = 4, then a is
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3
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The sum of the first and third term of an arithmetic progression is 12 and the product of first and second term is 24, then first term is
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4
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How many terms are there in 20, 25, 30 . . . . . . 140?
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5
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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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6
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If a, b, c are in A.P., then (a – c)2/ (b2 – ac) =
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7
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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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8
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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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9
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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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10
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The 7th and 12th term of an arithmetic progression are -15 and 5 respectively. What is the 16th term?
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