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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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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2
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If k, 2k – 1 and 2k + 1 are three consecutive terms of an AP, the value of k is
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3
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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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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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5
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If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
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6
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If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 term is
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7
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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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8
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If the sum of n terms of an A.P. is 3n2 + 5n then which of its terms is 164 ?
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9
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If the sum of the series 2 + 5 + 8 + 11 … is 60100, then the number of terms are
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10
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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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