18. The sum of first n terms of an AP whose first term is 8 and the common difference is 21
equal to the sum of first 2n terms of another AP whose first term is-30 and the common difference is 8.Find n.
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The sum of first n terms of an AP whose first term is 8 and the common difference is 21
equal to the sum of first 2n terms of another AP whose first term is-30 and the common difference is 8.Find n.
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