Evaluate:
1012 - 1002
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372 - 362
852 - 842
Without doing the actual addition, find the sum of:
1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23
1 + 3 + 5 + 7 + 9 + …………… + 39 + 41