For an A.P. if a25  a20 = 45, then d equals to:
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The sum of first n odd natural numbers in
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The nth term of an A.P., the sum of whose n terms is Sn, is
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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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In an A.P., if d = 4, n = 7, a_{n} = 4, then a is
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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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Let S denotes the sum of n terms of an A.P. whose first term is a. If the common difference d is given by d = S_{n} – k S_{n1} + S_{n2} then k =
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What is the sum of the following series? 64, 66, 68, ......, 100
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If a + 1, 2a + 1, 4a  1 are in A.P., then the value of a is:
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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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The common difference of the A.P. \(\frac{1}{3}, \frac{{1  3b}}{3} , \frac{{1  6b}}{3}\) . . . . . . is
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