In an A.P., if d = 4, n = 7, a_{n} = 4, then a is
6
7
20
28
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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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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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For an A.P. if a25  a20 = 45, then d equals to:
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4
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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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5
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The 2^{nd} and 6^{th} term of an arithmetic progression are 8 and 20 respectively. What is the 20^{th} term?
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6
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The 3rd and 8th term of an arithmetic progression are 13 and 2 respectively. What is the 14th term?
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7
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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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8
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If the sums of n terms of two arithmetic progressions are in the ratio \(\frac{{3n + 5}}{{5n + 7}}\) then their nth terms are in the ration
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9
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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 7th and 21st terms of an AP are 6 and 22 respectively. Find the 26th term
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