In an A.P., if d = -4, n = 7, an = 4, then a is
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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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2
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If three numbers be in G.P., then their logarithms will be in
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3
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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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4
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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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5
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Let S denotes the sum of n terms of an A.P. whose first term is a. If the common difference d is given by d = Sn – k Sn-1 + Sn-2 then k =
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6
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The two geometric means between the number 1 and 64 are
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7
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The number of terms of the A.P. 3, 7, 11, 15, ....... to be taken so that the sum is 406 is
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8
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The 2nd and 6th term of an arithmetic progression are 8 and 20 respectively. What is the 20th term?
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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 sum of first five multiples of 3 is:
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