If the nth term of an A.P. is 2n + 1, then the sum of first n terms of the A.P. is
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Sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \) ....... is
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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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The 2nd and 8th term of an arithmetic progression are 17 and -1 respectively. What is the 14th term?
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15th term of A.P., x - 7, x - 2, x + 3, ........ is
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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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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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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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Find the 15th term of the sequence 20, 15, 10 . . . . .
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The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?
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Find the nth term of the following sequence :
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