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Find the number of terms of the A.P. -12, -9, 6, , 21. If 1 is added to each term of this A.P., then

Find the number of terms of the A.P. -12, -9, – 6, …, 21. If 1 is added to each term of this A.P., then find the sum of all terms of the A.P. thus obtained.

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