Use the approach in Gauss’s Problem to find the following sums of arithmetic sequences (do not use formulas):
a. 1+2+3+4+...+99
b. 1+3+5 +7 +...+ 1001
c. 3+6+9 + 12 + ... + 300
d. 4 + 8 + 12 + 13 + ... + 400
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