The sum of the 1st m terms of an AP is n...

The sum of the 1st m terms of an AP is n and the sum of the 1st n terms of the same AP is m. Find the sum of the 1st (m + n) terms of the AP.

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The sum of the first p terms of an A.P. is q and the sum of the first q terms of the same A.P. is p. Find the sum of the first (p+q) terms of the A.P.

The nth term of an A.P. is 7n-5, find the sum of first 20 terms of the series.

The n term of an A.P is 7n-5,find the sum of first 20 terms of the series.

If the sum of first p terms of an A.P. is equal to the sum of the first q terms, then find the sum of the first (p + q) terms.

The sum of the 4th and 8th terms of an AP is 24 and the sum of the 6th and 10th terms is 44. Find the first three terms of the AP.

The twelfth term of an A.P. is (-13) and the sum of its first four terms is 24, find the sum of first 10 terms of the A.P.

If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of first n terms.

If the sum of 1st n term of an AP is n(3n + 5), find its 10th term

The sum of first 21 terms of an A.P. is 28 and the sum of the 1st 28 terms is 21. Show that one term of the progression is zero and find the sum of the preceding terms.

The sum of n terms of an A.P is n^2 .Find the common difference.

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