If the sum of n terms of an A.P. be 3n2 + n and its common difference is 6, then its first term is
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The 3rd and 6th term of an arithmetic progression are 13 and -5 respectively. What is the 11th term?
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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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Find the nth term of the following sequence :
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4
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If Sn denote the sum of the first n terms of an A.P. If S2n = 3Sn , then S3n : Sn is equal to
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5
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Which term of the A.P. 24, 21, 18, ............ is the first negative term?
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6
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The sum of the first and third term of an arithmetic progression is 12 and the product of first and second term is 24, then first term is
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7
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The sum of first n odd natural numbers in
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8
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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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9
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If 18, a, b - 3 are in A.P. then a + b =
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10
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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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