formula for n th term of an SP
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The general form of an Arithmetic Progression is a, a + d, a + 2d, a + 3d and so on. Thus nth term of an AP series is Tn = a + (n - 1) d, where Tn = nth term and a = firstterm. Here d = common difference = Tn - Tn-1.The sum of n terms is also equal to the formula where l is the last term.
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Answer:
an = a + ( n-1)d
Sn = n/2 (2a+(n-1)d)
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