Find the first term of an AP whose 8th and 12th terms are respectively 39 and 59.
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In an A.P., if d = -4, n = 7, an = 4, then a is
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2
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The two geometric means between the number 1 and 64 are
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3
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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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4
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The 7th and 21st terms of an AP are 6 and -22 respectively. Find the 26th term
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5
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The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?
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6
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15th term of A.P., x - 7, x - 2, x + 3, ........ is
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7
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How many terms are there in 20, 25, 30 . . . . . . 140?
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8
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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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9
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If the nth term of an A.P. is 2n + 1, then the sum of first n terms of the A.P. is
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10
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The sum of first n odd natural numbers in
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