If the sums of n terms of two arithmetic progressions are in the ratio \(\frac{{3n + 5}}{{5n + 7}}\) then their nth terms are in the ration
\(\frac{{3n - 1}}{{5n - 1}}\)
\(\frac{{3n + 1}}{{5n + 1}}\)
\(\frac{{5n + 1}}{{3n + 1}}\)
\(\frac{{5n - 1}}{{3n - 1}}\)
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1
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The sum of first five multiples of 3 is:
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2
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What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?
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3
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If 18, a, b - 3 are in A.P. then a + b =
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4
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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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5
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How many terms are there in 20, 25, 30 . . . . . . 140?
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6
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A bacteria gives birth to two new bacteria in each second and the life span of each bacteria is 5 seconds. The process of the reproduction is continuous until the death of the bacteria. initially there is one newly born bacteria at time t = 0, the find the total number of live bacteria just after 10 seconds :
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7
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What is the sum of the first 11 terms of an arithmetic progression if the 3rd term is -1 and the 8th term is 19?
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8
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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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9
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If the sum of n terms of an A.P. be 3n2 + n and its common difference is 6, then its first term is
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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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