For an A.P. if a25 - a20 = 45, then d equals to:
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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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Two A.P.’s have the same common difference. The first term of one of these is 8 and that of the other is 3. The difference between their 30th terms is
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3
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If the sum of p terms of an A.P. is q and the sum of q terms is p, then the sum of (p + q) terms will be
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4
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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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5
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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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6
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The 3rd and 6th term of an arithmetic progression are 13 and -5 respectively. What is the 11th term?
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7
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If the 7th term of a H.P. is 1/10 and the 12th term is 1/25, then the 20th term is
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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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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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10
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The sum of first n odd natural numbers in
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