In an A.P., if d = -4, n = 7, an = 4, then a is
6
7
20
28
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1
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The sum of first n odd natural numbers in
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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 3rd and 8th term of an arithmetic progression are -13 and 2 respectively. What is the 14th term?
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4
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If the sums of n terms of two arithmetic progressions are in the ratio \(\frac{{3n + 5}}{{5n + 7}}\) then their nth terms are in the ration
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5
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If the 3rd and the 5th term of an arithmetic progression are 13 and 21, what is the 13th term?
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6
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What is the sum of the first 12 terms of an arithmetic progression if the first term is -19 and last term is 36?
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7
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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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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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If 7 times the seventh term of an Arithmetic Progression (AP) is equal to 11 times its eleventh term, then the 18th term of the AP will be
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10
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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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