The sum of the first eight terms of an a.p is 8 and the sum of the first sixteen terms is 144. find the twelfth terms
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The Sum Formula
To do this, we have a formula that will help us. The formula says that the sum of the first n terms of our arithmetic sequence is equal to n divided by 2 times the sum of twice the beginning term, a, and the product of d, the common difference, and n minus 1.
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