For A.P. T18 - T8 = ........ ?
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1
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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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2
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Sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \) ....... is
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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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If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 term is
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5
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Find the 15th term of the sequence 20, 15, 10 . . . . .
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6
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If S1 is the sum of an arithmetic progression of ‘n’ odd number of terms and S2 is the sum of the terms of the series in odd places, then \(\frac{{{S_1}}}{{{S_2}}}\)
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7
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The sum of first five multiples of 3 is:
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8
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The nth term of an A.P., the sum of whose n terms is Sn, is
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9
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If three numbers be in G.P., then their logarithms will be in
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10
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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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