If log 2, log (2x -1) and log (2x + 3) are in A.P, then x is equal to ___
5/2
log25
log32
3/2
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What is the sum of the first 12 terms of an arithmetic progression if the 3rd term is -13 and the 6th term is -4?
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2
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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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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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What is the sum of all 3 digit numbers that leave a remainder of '2' when divided by 3?
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5
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The sum of first n odd natural numbers in
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6
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Find the 15th term of the sequence 20, 15, 10 . . . . .
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7
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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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8
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The nth term of an A.P., the sum of whose n terms is Sn, is
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9
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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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10
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Find the nth term of the following sequence :
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