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 sum of first five multiples of 3 is:
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2
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What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?
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3
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For an A.P. if a25 - a20 = 45, then d equals to:
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4
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Sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \) ....... is
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5
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If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
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6
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The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is
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7
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Find the first term of an AP whose 8th and 12th terms are respectively 39 and 59.
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8
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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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9
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If a + 1, 2a + 1, 4a - 1 are in A.P., then the value of a is:
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10
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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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