Find the sum :
(-11) + (-7) + (-3) + 1 +……to 12 terms.
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2 + 7 + 12 + 17 + ….. to 19 terms.
9 + 7 + 5 + 3 +……to 14 terms.
0.6 + 1.7 + 2.8 +….. to 100 terms.