If a + 1, 2a + 1, 4a  1 are in A.P., then the value of a is:
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If 18, a, b  3 are in A.P. then a + b =
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How many 2digit positive integers are divisible by 4 or 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 3rd and 8th term of an arithmetic progression are 13 and 2 respectively. What is the 14th term?
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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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What is the sum of the first 12 terms of an arithmetic progression if the 3^{rd} term is 13 and the 6^{th} term is 4?
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What is the sum of the first 17 terms of an arithmetic progression if the first term is 20 and last term is 28?
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Two A.P.’s have the same common difference. The first term of one of these is 8 and that of the other is 3. The difference between their 30th terms is
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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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In an A.P., if d = 4, n = 7, a_{n} = 4, then a is
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