If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
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The two geometric means between the number 1 and 64 are
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The nth term of an A.P., the sum of whose n terms is Sn, is
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3
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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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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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If S1 is the sum of an arithmetic progression of ‘n’ odd number of terms and S2 is the sum of the terms of the series in odd places, then \(\frac{{{S_1}}}{{{S_2}}}\)
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The sum of first five multiples of 3 is:
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7
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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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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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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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Which term of the A.P. 24, 21, 18, ............ is the first negative term?
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