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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If 18, a, b  3 are in A.P. then a + b =
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If log 2, log (2^{x} 1) and log (2^{x} + 3) are in A.P, then x is equal to ___
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The number of terms of the A.P. 3, 7, 11, 15, ....... to be taken so that the sum is 406 is
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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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The sum of first five multiples of 3 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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How many terms are there in 20, 25, 30 . . . . . . 140?
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If 7 times the seventh term of an Arithmetic Progression (AP) is equal to 11 times its eleventh term, then the 18th term of the AP will be
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For A.P. T18  T8 = ........ ?
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What is the sum of the first 11 terms of an arithmetic progression if the 3rd term is 1 and the 8th term is 19?
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