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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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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If log 2, log (2^{x} 1) and log (2^{x} + 3) are in A.P, then x is equal to ___
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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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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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The sum of first five multiples of 3 is:
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The nth term of an A.P., the sum of whose n terms is Sn, is
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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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For an A.P. if a25  a20 = 45, then d equals to:
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15th term of A.P., x  7, x  2, x + 3, ........ is
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(1) + (1 + 1) + (1 + 1 + 1) + ....... + (1 + 1 + 1 + ...... n  1 times) = ......
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