the first term of an arithmetic sequence is 1 and the sum of the first four terms is 100 .find the first four terms
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sum of n terms of an AP
=n/2 (first term +last term)
100=2(1+x)
x=49
Last term is 49
=n/2 (first term +last term)
100=2(1+x)
x=49
Last term is 49
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