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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If 18, a, b - 3 are in A.P. then a + b =
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2
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If the 7th term of a H.P. is 1/10 and the 12th term is 1/25, then the 20th term is
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3
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How many terms are there in 20, 25, 30 . . . . . . 140?
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4
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Find the 15th term of the sequence 20, 15, 10 . . . . .
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5
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Find the nth term of the following sequence :
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6
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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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7
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If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 term is
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8
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If a, b, c are in A.P., then (a – c)2/ (b2 – ac) =
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9
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Sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \) ....... is
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10
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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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