If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
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The two geometric means between the number 1 and 64 are
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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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The 7th and 12th term of an arithmetic progression are 15 and 5 respectively. What is the 16th term?
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4
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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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5
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The 2^{nd} and 6^{th} term of an arithmetic progression are 8 and 20 respectively. What is the 20^{th} term?
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6
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The 3rd and 9th term of an arithmetic progression are 8 and 10 respectively. What is the 16th term?
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7
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Sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \) ....... is
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8
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What is the sum of all 3 digit numbers that leave a remainder of '2' when divided by 3?
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9
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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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10
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How many terms are there in 20, 25, 30 . . . . . . 140?
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