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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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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2
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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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How many terms are there in the GP 5, 20, 80, 320........... 20480?
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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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What is the sum of all positive integers up to 1000, which are divisible by 5 and are not divisible by 2?
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6
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How many terms are there in 20, 25, 30 . . . . . . 140?
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7
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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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8
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What is the sum of the first 12 terms of an arithmetic progression if the 3rd term is -13 and the 6th term is -4?
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9
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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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10
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Let S denotes the sum of n terms of an A.P. whose first term is a. If the common difference d is given by d = Sn – k Sn-1 + Sn-2 then k =
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