If a + 1, 2a + 1, 4a - 1 are in A.P., then the value of a is:
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1
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Find the 15th term of the sequence 20, 15, 10 . . . . .
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2
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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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3
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The 4th and 7th term of an arithmetic progression are 11 and -4 respectively. What is the 15th term?
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4
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If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
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5
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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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6
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Sum of n terms of the series \(\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + \) ....... is
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7
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(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n - 1 times) = ......
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8
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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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9
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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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10
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The common difference of the A.P. \(\frac{1}{{2b}} \frac{{1 - 6b}}{{2b}} \frac{{1 - 12b}}{{2b}}\) . . . . . is
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