If a + 1, 2a + 1, 4a  1 are in A.P., then the value of a is:
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15th term of A.P., x  7, x  2, x + 3, ........ is
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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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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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How many terms are there in 20, 25, 30 . . . . . . 140?
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The nth term of an A.P., the sum of whose n terms is Sn, is
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The two geometric means between the number 1 and 64 are
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The 3rd and 7th term of an arithmetic progression are 9 and 11 respectively. What is the 15th term?
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A piece of equipment cost a certain factory 6,00,000. If it depreciates in value, 15% the first year, 13.5% the next year, 12% the third year, and so on, what will be its value at the end of 10 years, all percentages applying to the original cost?
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In an A.P., if d = 4, n = 7, a_{n} = 4, then a is
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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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