If the 7th term of a H.P. is 1/10 and the 12th term is 1/25, then the 20th term is
1/41
1/45
1/49
1/37
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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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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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3
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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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4
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A square is drawn by joining the mid points of the sides of a given square in the same way and this process continues indefinitely. If a side of the first square is 4 cm, determine the sum of the areas all the square.
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5
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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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6
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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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7
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Find the 15th term of the sequence 20, 15, 10 . . . . .
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8
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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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9
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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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10
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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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