The sum of first five multiples of 3 is:
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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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2
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The first and last term of an A.P. is a and l respectively. If S is the sum of all the terms of the A.P. and the common difference is given by \(\frac{{{l^2} - {a^2}}}{{k - \left( {l + a} \right)}}\) then k = ?
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3
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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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4
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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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5
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If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are
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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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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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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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15th term of A.P., x - 7, x - 2, x + 3, ........ is
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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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