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The first and last terms of an A.P. are 1 and 11. If the sum of its terms is 36, then the number of terms will be

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In A.M.’s are introduced between 3 and 17 such that the ratio of the last mean to the first mean is 3 : 1, then the value of n is

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If denotes the sum of first n terms of an A.P. such that , then

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If the sum of n terms of an A.P., is 3 which of its terms is 164?

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If the sum of n terms of an A.P. is 2, then its nth term is