If a + 1, 2a + 1, 4a - 1 are in A.P., then the value of a is:
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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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2
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If the sum of the series 2 + 5 + 8 + 11 … is 60100, then the number of terms are
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3
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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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4
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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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5
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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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6
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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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7
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If the sum of three consecutive terms of an increasing A.P. is 51 and the product of the first and third of these terms is 273, then the third term is :
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8
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If log 2, log (2x -1) and log (2x + 3) are in A.P, then x is equal to ___
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9
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The number of terms of the A.P. 3, 7, 11, 15, ....... to be taken so that the sum is 406 is
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10
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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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