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If Sr denotes the sum of the first r terms of an AP then, S3nS2n-Sn is

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Important Questions on Arithmetic Progression

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If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 terms is
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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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Sum of n terms of the series 2+8+18+32+... is

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The 9th term of an A.P. is 449 and 449th term is 9. The term which is equal to zero is
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If 1x+2, 1x+3, 1x+5 are in A.P. Then, x=
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The nth term of an A.P., whose sum of n terms is Sn, is
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The common difference of an A.P., the sum of whose n terms is Sn, is
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If the sums of n terms of two arithmetic progressions are in the ratio 3n+55n+7, then their nth  terms are in the ratio