Find the 15th term of the sequence 20, 15, 10 . . . . .
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1
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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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2
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A boy agrees to work at the rate of one rupee on the first day, two rupees on the second day, and four rupees on third day and so on. How much will the boy get if he started working on the 1st of February and finishes on the 20th of February?
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3
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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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4
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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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5
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How many terms are there in the GP 5, 20, 80, 320........... 20480?
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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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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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8
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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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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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If three numbers be in G.P., then their logarithms will be in
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