Find the middle term (or terms) and the sum of each of the following series :
2+5+8+….+152

Find the middle term (or terms) and the sum of each of the following series : 2+2.4+2.8+…+10.4

Find the middle term (or terms) and the sum of each of the following series : (1)/(2) + (1)/(3) + (1)/(6)+…+(-(5)/(6))

Find the middle terms (or terms) and the sum of the following arithmetic series : 3+7+11+15+….95

Find the nth terms and the sum to n terms of the following series : 5 + 13 + 37 + 109 + 325 + ….

Find the sum to n terms of each of the following series : 2.4 + 6.8 + 10.12+…

Find the sum of n terms of the following series : 2+5+10+ 17+ .......

Find the sum to n terms of each of the following series : 2 + 22 + 222 +…

Find the sum to n terms of each of the following series : 1^(2) + 3^(2) + 5^(2) +…