Find the 15th term of the sequence 20, 15, 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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The 3rd and 6th term of an arithmetic progression are 13 and 5 respectively. What is the 11th term?
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3
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If three numbers be in G.P., then their logarithms will be in
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4
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How many terms are there in the GP 5, 20, 80, 320........... 20480?
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5
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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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6
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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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7
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Which term of the A.P. 92, 88, 84, 80, ...... is 0?
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8
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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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9
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The 4th and 7th term of an arithmetic progression are 11 and 4 respectively. What is the 15th term?
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10
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In an A.P., if d = 4, n = 7, a_{n} = 4, then a is
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