If 18th and 11th term of an A.P. are in the ratio 3 : 2, then its 21st and 5th terms are in the ratio
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1
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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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10
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If a + 1, 2a + 1, 4a - 1 are in A.P., then the value of a is:
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2
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If a + 1, 2a + 1, 4a - 1 are in A.P., then the value of a is:
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3
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If the sum of p terms of an A.P. is q and the sum of q terms is p, then the sum of (p + q) terms will be
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4
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Find the first term of an AP whose 8th and 12th terms are respectively 39 and 59.
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5
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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 = Sn – k Sn-1 + Sn-2 then k =
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6
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The sum of first n odd natural numbers in
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7
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What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?
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8
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The 2nd and 6th term of an arithmetic progression are 8 and 20 respectively. What is the 20th term?
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9
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(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n - 1 times) = ......
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