For an A.P. if a25 - a20 = 45, then d equals to:
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Find the nth term of the following sequence :
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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 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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The common difference of the A.P. \(\frac{1}{3}, \frac{{1 - 3b}}{3} , \frac{{1 - 6b}}{3}\) . . . . . . is
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If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are
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How many terms are there in 20, 25, 30 . . . . . . 140?
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What is the sum of the first 12 terms of an arithmetic progression if the first term is -19 and last term is 36?
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The sum of first five multiples of 3 is:
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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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If k, 2k – 1 and 2k + 1 are three consecutive terms of an AP, the value of k is
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