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If the sum of n terms of an A.P. be 3 and its common difference is 6, then its first term is

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If 7th and 13th terms of an A.P. be 34 and 64 respectively, then its 18th term 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 or p + q terms will be

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Sum of all two digit numbers which when divided by 4 yield unity as remainder is

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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