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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1
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The sum of the first four terms of an A.P. is 56. The sum of the last four terms is 112. If its first term is 11, the number of terms is
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2
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In an A.P., if d = 4, n = 7, an = 4, then a is
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3
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Two A.P.’s have the same common difference. The first term of one of these is 8 and that of the other is 3. The difference between their 30th terms is
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4
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How many 2digit positive integers are divisible by 4 or 9?
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5
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For A.P. T18  T8 = ........ ?
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6
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If the sum of p terms of an A.P. is q and the sum of q terms is p, then the sum of (p + q) terms will be
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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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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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9
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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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10
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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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