15th term of A.P., x  7, x  2, x + 3, ........ is
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1
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The sum of first five multiples of 3 is:
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2
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If 18, a, b  3 are in A.P. then a + b =
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3
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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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4
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If the 7^{th} term of a H.P. is 1/10 and the 12^{th} term is 1/25, then the 20^{th} term is
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5
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If k, 2k – 1 and 2k + 1 are three consecutive terms of an AP, the value of k is
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6
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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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7
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How many terms are there in the GP 5, 20, 80, 320........... 20480?
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8
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What is the sum of the first 12 terms of an arithmetic progression if the 3^{rd} term is 13 and the 6^{th} term is 4?
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9
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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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10
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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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