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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2
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The nth term of an A.P., the sum of whose n terms is Sn, is
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3
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The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its
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4
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In an A.P., if d = -4, n = 7, an = 4, then a is
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5
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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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6
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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 = Sn – k Sn-1 + Sn-2 then k =
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7
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What is the sum of the following series? -64, -66, -68, ......, -100
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8
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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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9
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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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10
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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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