Use the approach in Gauss’s Problem to find the following sums of arithmetic sequences (do not use formulas):
a. 1 + 2 + 3 + 4+ ...+49
b. 1 + 3+ 5 + 7 + ...+ 2009
c. 6 + 12 + 18 + ... + 600
d. 1000 + 995 + 990 + ... + 5
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