What is the sum of the first 17 terms of an arithmetic progression if the first term is -20 and last term is 28?
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If the sum of three consecutive terms of an increasing A.P. is 51 and the product of the first and third of these terms is 273, then the third term is :
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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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3
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The 4th and 7th term of an arithmetic progression are 11 and -4 respectively. What is the 15th term?
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4
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Consider an infinite G.P. with first term a and common ratio r, its sum is 4 and the second term is 3/4, then
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5
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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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6
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The sum of the first and third term of an arithmetic progression is 12 and the product of first and second term is 24, then first term is
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7
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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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8
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For an A.P. if a25 - a20 = 45, then d equals to:
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9
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(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n - 1 times) = ......
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10
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Sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \) ....... is
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