n= (1,2,3...)
So,
1st term = 1+1/2 +1/2 = 1+1 = 2
2nd = 1+2/2 +4/2 = 4
3rd = 1+3/2 +9/2 = 7
4th = 1+4/2 +16/2 = 11
So,
Series will be = 2,4,7,11,16,22,29,37, 46, 56, 67, 79, 92, 106, 121, 137, 154, 172, 191, 211
So,
Common difference is not same so, its not a AP series,
Adding = 1560
D✔️
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