The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?
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What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?
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2
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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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3
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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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4
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In an A.P., if d = -4, n = 7, an = 4, then a is
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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 sum of first five multiples of 3 is:
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7
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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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8
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Sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \) ....... is
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9
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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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10
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The first term of an Arithmetic Progression is 22 and the last term is -11. If the sum is 66, the number of terms in the sequence are:
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