Find the sum to n terms of the series: 5+11+19+29+41+....
[I can't understand special series at all so please explain the steps as much as possible.]
[for example: in the answer Sn=5+11+19+29+..+an-1+an
Sn=5+11+19+...+an-2+an-1+an
Shouldn't subtracting the two terms give us 0 as the result?]
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