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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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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2
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If 18th and 11th term of an A.P. are in the ratio 3 : 2, then its 21st and 5th terms are in the ratio
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3
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The sum of first n odd natural numbers in
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4
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If a, b, c are in A.P., then (a – c)2/ (b2 – ac) =
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5
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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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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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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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8
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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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9
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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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10
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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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